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Fungi on leaf Black & White Stock Photos
![. The fungi which cause plant disease . Plant diseases; Fungi. Leaf Dssue 17-32 X 14-20 II. II. Urediniospores pale-brown, aculeolate, 24-33 X 16-20 II. III. Teliospores elliptical or subglobose, smooth, dark-brown, apex much thick- ened, with a small, hyaline, wart- like papilla, 2&-35 x 20-26 ii. An autoecious eu-type. On Phaseolus, Dolichos and other related legumes. The sori usually appear late in the season on leaves, rarely on stems and pods. The myceliiun is local. Great difference in varietal susceptibility is noted. U. pisi (Pers.) de B." I. (=^cidium cyparissiae). Fig. 267.— Stock Photo](https://c8.alamy.com/comp/PG460H/the-fungi-which-cause-plant-disease-plant-diseases-fungi-leaf-dssue-17-32-x-14-20-ii-ii-urediniospores-pale-brown-aculeolate-24-33-x-16-20-ii-iii-teliospores-elliptical-or-subglobose-smooth-dark-brown-apex-much-thick-ened-with-a-small-hyaline-wart-like-papilla-2amp-35-x-20-26-ii-an-autoecious-eu-type-on-phaseolus-dolichos-and-other-related-legumes-the-sori-usually-appear-late-in-the-season-on-leaves-rarely-on-stems-and-pods-the-myceliiun-is-local-great-difference-in-varietal-susceptibility-is-noted-u-pisi-pers-de-bquot-i-=cidium-cyparissiae-fig-267-PG460H.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. Leaf Dssue 17-32 X 14-20 II. II. Urediniospores pale-brown, aculeolate, 24-33 X 16-20 II. III. Teliospores elliptical or subglobose, smooth, dark-brown, apex much thick- ened, with a small, hyaline, wart- like papilla, 2&-35 x 20-26 ii. An autoecious eu-type. On Phaseolus, Dolichos and other related legumes. The sori usually appear late in the season on leaves, rarely on stems and pods. The myceliiun is local. Great difference in varietal susceptibility is noted. U. pisi (Pers.) de B." I. (=^cidium cyparissiae). Fig. 267.— Stock Photo")
RMPG460H–. The fungi which cause plant disease . Plant diseases; Fungi. Leaf Dssue 17-32 X 14-20 II. II. Urediniospores pale-brown, aculeolate, 24-33 X 16-20 II. III. Teliospores elliptical or subglobose, smooth, dark-brown, apex much thick- ened, with a small, hyaline, wart- like papilla, 2&-35 x 20-26 ii. An autoecious eu-type. On Phaseolus, Dolichos and other related legumes. The sori usually appear late in the season on leaves, rarely on stems and pods. The myceliiun is local. Great difference in varietal susceptibility is noted. U. pisi (Pers.) de B." I. (=^cidium cyparissiae). Fig. 267.—
RMRDAMK7–. Beginners' botany. Botany. taches itself to another plant, the dod- der dies away at the base and becomes wholly dependent. It produces flowers in clusters and seeds itself freely (Fig. 133). Parasites and Saprophytes. — A plant that is dependent on a living plant or animal is a parasite, and the plant or animal on which it lives is the host. The dodder is a true parasite; so are the rusts, mildews, and other fungi that attack leaves and shoots and injure them. The threads of a parasitic fungus usually creep through the intercellular spaces in the leaf or stem and send suckers (or haustoria)
RMPG46D9–. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 186.—Didymella. A, ascus; B, hymenium of a pycnidium. After Brefeld. Fig. 187. — Didyipo- sphxria. C, an as- cus; D, con idio- phore and conidia. After Brefeld. Fig. 188. —Dflo- p h 1 a gramiiiis. J, ascus; K, spore. After Winter. D. sphaeroides (Pers.) Fr. is on Populus leaves in Europe. D. catalpse.'^^ Perithecia very small, scattered, embedded in the tissue of the leaf, pyriform to nearly spherical, varying in width from 48-104 n and in depth from 64^140 ii; ostiole broadly conical, erumpent; asci 8-spored, cylindrical, usu
RMRDC2AX–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. THK PARASITIC EXOASCP^AE. 16T Exoascus coerulescens (Mont, et Desm.) produces similar blisters on oak leaves.. Fig. 63.—JExoctscus aureus. Leaf section from the margiu of a swelling, showing normal and hypertropbied tissue. The cells of the swelling are abnormally elongated with thickened walls, and some show secondary cell-division. The bases of the asci are wedged in between the cells; one ascus is shown with coni
![. The fungi which cause plant disease . Plant diseases; Fungi. .1 B Fia. 131.—U. necator. Photomicrographs of perithecia oq surface of leaf. A, Magnified 8 times. B, Magnified 35 times. After Bioletti. specially resistant cells of the mycelium which develop within knotty swellings near the haustoria.''" U. salicis (D. C.) Wint. on willow and poplar in Europe, Asia, and America, U. aceris (D. C.) Sacc. and U. circinata C. &. P. on maple are common species. U. flexuosa Pk. occurs on Ji^sculus. and elm, U. clandestina (Biv.) Schr. on elm, U. pmnastri (D. C.) Sacc. on species of Prunus, e Stock Photo](https://c8.alamy.com/comp/PG4GEW/the-fungi-which-cause-plant-disease-plant-diseases-fungi-1-b-fia-131u-necator-photomicrographs-of-perithecia-oq-surface-of-leaf-a-magnified-8-times-b-magnified-35-times-after-bioletti-specially-resistant-cells-of-the-mycelium-which-develop-within-knotty-swellings-near-the-haustoriaquot-u-salicis-d-c-wint-on-willow-and-poplar-in-europe-asia-and-america-u-aceris-d-c-sacc-and-u-circinata-c-amp-p-on-maple-are-common-species-u-flexuosa-pk-occurs-on-jisculus-and-elm-u-clandestina-biv-schr-on-elm-u-pmnastri-d-c-sacc-on-species-of-prunus-e-PG4GEW.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. .1 B Fia. 131.—U. necator. Photomicrographs of perithecia oq surface of leaf. A, Magnified 8 times. B, Magnified 35 times. After Bioletti. specially resistant cells of the mycelium which develop within knotty swellings near the haustoria.''" U. salicis (D. C.) Wint. on willow and poplar in Europe, Asia, and America, U. aceris (D. C.) Sacc. and U. circinata C. &. P. on maple are common species. U. flexuosa Pk. occurs on Ji^sculus. and elm, U. clandestina (Biv.) Schr. on elm, U. pmnastri (D. C.) Sacc. on species of Prunus, e Stock Photo")
RMPG4GEW–. The fungi which cause plant disease . Plant diseases; Fungi. .1 B Fia. 131.—U. necator. Photomicrographs of perithecia oq surface of leaf. A, Magnified 8 times. B, Magnified 35 times. After Bioletti. specially resistant cells of the mycelium which develop within knotty swellings near the haustoria.''" U. salicis (D. C.) Wint. on willow and poplar in Europe, Asia, and America, U. aceris (D. C.) Sacc. and U. circinata C. &. P. on maple are common species. U. flexuosa Pk. occurs on Ji^sculus. and elm, U. clandestina (Biv.) Schr. on elm, U. pmnastri (D. C.) Sacc. on species of Prunus, e
RMRDWE9B–. Elementary botany. Botany. 324 ECO LOG V. only a short branch of the mycelium, nutritive substances are taken by the fungus from the protoplasm or cell-sap of the carnation. From here it passes to the threads of the mycelium. These in turn supply food material for the development of the dark brown gonidia, which we see form the dark- looking powder on the spots. Many other fungi form haustoria, which take up nutrient matters in the way described for the carnation rust. In the case. Fig. 427. Cell from carnation leaf, showing haustoriuin of rust mycelium grasping the nucleus of the host. A, h
RMPG3NTF–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 365 LIII. LEAF BLIGHT OF PEAR AND QUINCE Leaf Blight. Cornell Entomosporium maculatum Lev. Duggar, B. M. Some Important Pear Diseases. II. Agl. Exp. Sta. Built. 145: 611-615. 1898. Fairchild, D. G. Experiments in Preventing Leaf Diseases of Nursery Stock in Western New York. N. Y. Agl. Exp. Sta. Rept. 11 : 642-652. 1892. (Also, Journ. Myc. 8: 338-351.) Scribner, F. L. Leaf-Blight and Cracking of the Pear. U S Dept Ad (1888): 357-364. Habitat relations. The leaf bli
RMRDC2GF–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fig. 45.—Trotomyces macrosporus on leaf-stalk of Aegopodium Podagraria. A, Mycelium and sporangium in the tissue xinder the epidermis. S, Sporangia in stages of development, (v. Tubeuf del.) latter is a secondary process and consists (see Fig. 9) in the formation of exceedingly delicate membranes inside the original. Fig. 46.—Protomyces macrosporus. Section of petiole of Aegopodium witk two swellings containing spor
RMPG4GJT–. The fungi which cause plant disease . Plant diseases; Fungi. 162 THE FUNGI WHICH CAUSE PLANT DISEASE Ascocarps scattered on the leaf, shining black, up to 1 mm. long; asci clavate, 8-spored; spores nearly as long as the ascus, 90-120 X 1.5 M- Conidia cylindric, hyaline, continuous, 6-8 x 1 /t. L. brachysporum Rost. Perithecia epiphyllous; asci cylindric, short- stalked, apex rounded, 120 x 20-25 p., 8- spored; paraphyses bacillar, apex curved; spores oblong, l-rowed, hyaline, 28-30 x 9-10 /x. It is common on pine leaves.^ Several other species are parasitic upon various conifers, among them:
RMRDEX9G–. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 199 have already been mentioned as living in an unequal partner- ship with root fungi in which the green plants are the dominant partners. They are not however found as parasites on other green plants. Higher seed plants. A number of Minnesota species of the higher seed plants are known as true parasites on other leaf- green plants and a few of these are of economic importance. When a race of plants which was originally self supporting by. Fi G. 101—Twig of a witches'-broom of spruce, showing the parasitic plants of the mist
RMPG4G37–. The fungi which cause plant disease . Plant diseases; Fungi. 240 THE FUNGI WHICH CAUSE PLANT DISEASE the leaf on such varieties as have leaves which are smooth beneath. The pyncidia, however, have never been seen on the under side of the leaf in our varieties. On stems, tendrils, peduncles, petioles and leaf veins the spot in its first appearance is a small darkened depression which soon becomes very black. On a cane the lesion rarely extends more than a quarter of the way round, while on a tendril or leaf petiole it may extend from half to all of the way round. On shoots, the lesions never
RMRDJ5PM–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 431 produced in short chains and measure 24-28 x 18-21 fj, (Fig. 210,b). The uredesori occur on the under surface of the leaf. They are somewhat lighter colored than the casoma and are constantly inclosed by paraphyses. Individual spores are about the same in size and form, however, as the previous type (Fig. 210, c). In the same sori with the latter may be produced also the teleutospores,. Please note that these images are extracted from scanned page images tha
RMPG3NT4–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. disease is distinguished from the leaf spot by smaller spots more colored when young and more nearly circular. They are also less clearly defined on the under surfaces. The blight also attacks the fruit. In this case the spots are at first red but later darker in color. The drying of the surface layers accom- panying the effects of this disease may cause a cracking very much as in the case of pear scab. The fungus. The larger spots of the leaf blight will generally show at the time
RMRDYHMD–. The mushroom book : a popular guide to the identification and study of our commoner fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. The Relation of Fungi to Other Plants. Pistil of St. Johns- wort Seed-box of iris learn with the microscope that the pond scums which he had thought disgusting frog-spittle are in truth tangles of exquisite plants, made up of chains of slender, transpar- ent cells finer than silken threads, each eel) containing many tiny green par- ticles of leaf green, or chloro- phyll—the cause of the green colour
RMPG3NTA–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 366 FUNGOUS DISEASES OF PLANTS. disease is distinguished from the leaf spot by smaller spots more colored when young and more nearly circular. They are also less clearly defined on the under surfaces. The blight also attacks the fruit. In this case the spots are at first red but later darker in color. The drying of the surface layers accom- panying the effects of this disease may cause a cracking very much as in the case of pear scab. The fungus. The larger spots of the leaf blight
RMRDE2AN–. The mushroom book. A popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties. Mushrooms; Cookery (Mushrooms); cbk. From Spore to Mushroom AH corn smuts, wheat smuts, leaf rusts, toadstools, puff- balls, and brackets bear their spores on club-like cells, and for this reason are put in one group, called Basidiomycetes. The fact that corn smuts and leaf rusts feed on living plants, while toad- stools, brackets, and pufifballs feed on dead plants, separates them in- to two groups ; the smuts and rustsformingthe lower group, and the other
RMPG4484–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. DETAILED ACCOUNT OF SPECIFIC PLANT DISEASES S3S open out, the curling and arching of the blades become manifest. The curling may be confined to a small portion of a leaf, or it may be general and all of the leaves of a tree may be.affected, as well as the young stem on which^they are found. The green, or reddish, color of. Fig. 192.—Peach leaves deformed by leaf curl {Exoascus deformans). (.After Heald, F. D., Bull. 135 {Sci. Ser. 14), Univ. of Tex., Nov. 15, 1909.) the leaves is lost a
RMRE0RJH–. The mushroom book : a popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. Pistil of Pistil of violet St. Johns- wort Seed-box of iris learn with the microscope that the pond scums which he had thought disgusting frog-spittle are in truth tangles of exquisite plants, made up of chains of slender, transpar- ent cells finer than silken threads, each cell containing many tiny green par- ticles of leaf green, or chloro- phyll—the cause of the green colour of all green plants. A
![. The fungi which cause plant disease . Plant diseases; Fungi. 522 THE FUNGI WHICH CAUSE PLANT DISEASE The cause of leaf spots of tomato. It was noted in New Jersey about 1893»" and in Ohio in ISQG.^'^ It is one of the serious tomato pests. S. lactucae Pass.^^"* Spots irregular, brownish, angulate, sometimes destroying the entire leaf, pycnidia minute, punctiform, scattered, 90 n in diameter, conidia filiform, straight or curved, 25- 30 X 1.7-2 M- On lettuce. S. consimilis E. & M.'* Distinguishable from the preceding by the more indefinite spots, slightly larger pycnidia (90-100 Stock Photo](https://c8.alamy.com/comp/PG45P5/the-fungi-which-cause-plant-disease-plant-diseases-fungi-522-the-fungi-which-cause-plant-disease-the-cause-of-leaf-spots-of-tomato-it-was-noted-in-new-jersey-about-1893quot-and-in-ohio-in-isqg-it-is-one-of-the-serious-tomato-pests-s-lactucae-passquot-spots-irregular-brownish-angulate-sometimes-destroying-the-entire-leaf-pycnidia-minute-punctiform-scattered-90-n-in-diameter-conidia-filiform-straight-or-curved-25-30-x-17-2-m-on-lettuce-s-consimilis-e-amp-m-distinguishable-from-the-preceding-by-the-more-indefinite-spots-slightly-larger-pycnidia-90-100-PG45P5.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. 522 THE FUNGI WHICH CAUSE PLANT DISEASE The cause of leaf spots of tomato. It was noted in New Jersey about 1893»" and in Ohio in ISQG.^'^ It is one of the serious tomato pests. S. lactucae Pass.^^"* Spots irregular, brownish, angulate, sometimes destroying the entire leaf, pycnidia minute, punctiform, scattered, 90 n in diameter, conidia filiform, straight or curved, 25- 30 X 1.7-2 M- On lettuce. S. consimilis E. & M.'* Distinguishable from the preceding by the more indefinite spots, slightly larger pycnidia (90-100 Stock Photo")
RMPG45P5–. The fungi which cause plant disease . Plant diseases; Fungi. 522 THE FUNGI WHICH CAUSE PLANT DISEASE The cause of leaf spots of tomato. It was noted in New Jersey about 1893»" and in Ohio in ISQG.^'^ It is one of the serious tomato pests. S. lactucae Pass.^^"* Spots irregular, brownish, angulate, sometimes destroying the entire leaf, pycnidia minute, punctiform, scattered, 90 n in diameter, conidia filiform, straight or curved, 25- 30 X 1.7-2 M- On lettuce. S. consimilis E. & M.'* Distinguishable from the preceding by the more indefinite spots, slightly larger pycnidia (90-100
RMRDFE02–. Manual of tree diseases . Trees. 228 MANUAL OF TREE DISEASES tinguished from one another except by the microscopic chap- acters of the black fruiting-bodies which are just visible to the unaided eye. The mycelium of both fungi causes powdery white, more or less definite spots on the imder sides of the leaves. The life histories and control of powdery mildew fungi are discussed on page 37. Leaf-Bught Caused by Glceosporium sp. This leaf-blight has been observed on Norway maple (Acer platanoides) in Connecticut, New York and Virginia. No studies have been made on the disease and but little is
![. The fungi which cause plant disease . Plant diseases; Fungi. THE 'FUNGI WHICH CAUSE PLANT DISEASE 521 one in the center of each spot, but slightly prominent; conidia cylindric or clavate-cylindric, 10-25 x 1.5-2 n. On watermelon leaves. S. cucurbitacearum Sacc. is also on cucurbits. " S. cannabina Pk. is on hemp producing leaf spots. S, nicotianse Pat. is reported from France as the cause of tobacco leaf spotting."" S. doUchi B. & C. Spots white, with a broad, light brown margin; conidia straight, subfusiform, 3-septate, 40 m- On cowpeas."^ S. medicaginis Rob. & D Stock Photo](https://c8.alamy.com/comp/PG45PD/the-fungi-which-cause-plant-disease-plant-diseases-fungi-the-fungi-which-cause-plant-disease-521-one-in-the-center-of-each-spot-but-slightly-prominent-conidia-cylindric-or-clavate-cylindric-10-25-x-15-2-n-on-watermelon-leaves-s-cucurbitacearum-sacc-is-also-on-cucurbits-quot-s-cannabina-pk-is-on-hemp-producing-leaf-spots-s-nicotianse-pat-is-reported-from-france-as-the-cause-of-tobacco-leaf-spottingquotquot-s-douchi-b-amp-c-spots-white-with-a-broad-light-brown-margin-conidia-straight-subfusiform-3-septate-40-m-on-cowpeasquot-s-medicaginis-rob-amp-d-PG45PD.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. THE 'FUNGI WHICH CAUSE PLANT DISEASE 521 one in the center of each spot, but slightly prominent; conidia cylindric or clavate-cylindric, 10-25 x 1.5-2 n. On watermelon leaves. S. cucurbitacearum Sacc. is also on cucurbits. " S. cannabina Pk. is on hemp producing leaf spots. S, nicotianse Pat. is reported from France as the cause of tobacco leaf spotting."" S. doUchi B. & C. Spots white, with a broad, light brown margin; conidia straight, subfusiform, 3-septate, 40 m- On cowpeas."^ S. medicaginis Rob. & D Stock Photo")
RMPG45PD–. The fungi which cause plant disease . Plant diseases; Fungi. THE 'FUNGI WHICH CAUSE PLANT DISEASE 521 one in the center of each spot, but slightly prominent; conidia cylindric or clavate-cylindric, 10-25 x 1.5-2 n. On watermelon leaves. S. cucurbitacearum Sacc. is also on cucurbits. " S. cannabina Pk. is on hemp producing leaf spots. S, nicotianse Pat. is reported from France as the cause of tobacco leaf spotting."" S. doUchi B. & C. Spots white, with a broad, light brown margin; conidia straight, subfusiform, 3-septate, 40 m- On cowpeas."^ S. medicaginis Rob. & D
RMRDJ685–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 34° FUNGOUS DISEASES OF PLANTS very pronounced shot-hole effect. Varieties of Primus americana are frequently free from this fungus. Where a species or variety is subject to shot-hole diseases a shot- hole effect may also be produced upon the leaves by spraying with any substance injurious to the leaf. When the leaves are so severely injured that the spots coa- lesce, the large irregular pieces may fall out in the same manner as just indicated. In any case the effects of shot-hole
RMPG3YD8–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 312 FUNGOUS DISEASES OF PLANTS XVIII. EARLY BLIGHT OF CELERY Cercospora Apii Fr. Atkinson, Geo. F. Note on the Cercospora of Celery Blight. Cornell Agl. Exp. Sta. Built. 48: 314-316. fig. j. 1892. Duggar, B. M. Early Blight of Celery. Cornell Agl. Exp. Sta. Built. 132: 201-206. figs. 48-50. 1S97. Sturgis, W. C. On the Prevention of Leaf-Blight and Leaf-Spot of Celery. Conn. Agl. Exp. Sta. Rept. 21: 167-171. 1897. U. S. Dept. Agl. Rept. (1886): 117-120. Habitat relations. Cercospora
RMRDD70X–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. GYMNOSPORANGIUM. 397 the species already described in remaining closed at the apex, the spores escaping through trellis-like slits on the lateral walls of the peridia (Fig. 234). This fungus will not germinate on apple-trees, but on pears every leaf may be thickly covered with aecidia and pycnidia, and considerable damage to the crop thereby ensue (Fig. 233)... Pig. 231.—Longitudinal section through a conical teleut
![. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 336.—P. solitaria. 1-month-old colony on apple agar. After Scott and Rorer. The fimgus was grown in pure culture and its identity on twig, leaf and fruit was shown by cross inoculation. P. persicae Sacc. is common on peach leaves. P. piricola Sacc. & Speg. is foimd on apple and pear. P. limitata Pk.'" is reported as the cause of an apple leaf spot. Spots round minute, 2-6 mm., brown or reddish; pycnidia epiph- yllous, black, few, punctiform; spores ellipsoid, 7-8 x 4 jn. P. mail P. & D. occurs on apple and pear. P Stock Photo](https://c8.alamy.com/comp/PG0RBY/the-fungi-which-cause-plant-disease-plant-diseases-fungi-fig-336p-solitaria-1-month-old-colony-on-apple-agar-after-scott-and-rorer-the-fimgus-was-grown-in-pure-culture-and-its-identity-on-twig-leaf-and-fruit-was-shown-by-cross-inoculation-p-persicae-sacc-is-common-on-peach-leaves-p-piricola-sacc-amp-speg-is-foimd-on-apple-and-pear-p-limitata-pkquot-is-reported-as-the-cause-of-an-apple-leaf-spot-spots-round-minute-2-6-mm-brown-or-reddish-pycnidia-epiph-yllous-black-few-punctiform-spores-ellipsoid-7-8-x-4-jn-p-mail-p-amp-d-occurs-on-apple-and-pear-p-PG0RBY.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. Fig. 336.—P. solitaria. 1-month-old colony on apple agar. After Scott and Rorer. The fimgus was grown in pure culture and its identity on twig, leaf and fruit was shown by cross inoculation. P. persicae Sacc. is common on peach leaves. P. piricola Sacc. & Speg. is foimd on apple and pear. P. limitata Pk.'" is reported as the cause of an apple leaf spot. Spots round minute, 2-6 mm., brown or reddish; pycnidia epiph- yllous, black, few, punctiform; spores ellipsoid, 7-8 x 4 jn. P. mail P. & D. occurs on apple and pear. P Stock Photo")
RMPG0RBY–. The fungi which cause plant disease . Plant diseases; Fungi. Fig. 336.—P. solitaria. 1-month-old colony on apple agar. After Scott and Rorer. The fimgus was grown in pure culture and its identity on twig, leaf and fruit was shown by cross inoculation. P. persicae Sacc. is common on peach leaves. P. piricola Sacc. & Speg. is foimd on apple and pear. P. limitata Pk.'" is reported as the cause of an apple leaf spot. Spots round minute, 2-6 mm., brown or reddish; pycnidia epiph- yllous, black, few, punctiform; spores ellipsoid, 7-8 x 4 jn. P. mail P. & D. occurs on apple and pear. P
RMRDD7NE–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. FiG. 194.—PhrftgniidiiiTn sttbcwticium on a Rose leaf. The black spots are teleutospore-patches on the uuder- surface of the leaf. (v. Tubeuf deL) Fig. 193.— Tfipkragmium ulmai-iac on Spiraea Ulmai-ia. Germinating teleuto- spore, with promycelia and ^poridia. (After Tulasne.) teleutospores are produced in loose patches. The aecidial patches have no covering, but are surrounded by club-shaped paraphyses. The genus fr
RMPG3NWW–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 358 FUNGOUS DISEASES OF PLANTS XLIX. LEAF SPOT OF THE PEAR Septoria Pyricola Desm. Duggar, B. M. Some Important Pear Diseases. Leaf Spot. Cornell Agl. Exp. Sta. Built. 145: 597-611. figs. 157-163. 1898. The leaf spot of pear is a disease which may be readily dis- tinguished from the leaf blight subsequently described. It occurs throughout the eastern United States as an important fungus, both. Fig. 176. Leaf Spot of Pear in orchards and nurseries. It is probably found throughout No
RMRE0RGJ–. The mushroom book : a popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. Pistil of Pistil of violet St. Johns- wort Seed-box of iris learn with the microscope that the pond scums which he had thought disgusting frog-spittle are in truth tangles of exquisite plants, made up of chains of slender, transpar- ent cells finer than silken threads, each cell containing many tiny green par- ticles of leaf green, or chloro- phyll—the cause of the green colour of all green plants. A
RMPG4502–. The mushroom book. A popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties. Mushrooms; Cookery (Mushrooms); cbk. Com smut. Leaf rust on Hepaiica triloba. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marshall, Nina L. (Nina Lovering). New York, Doubleday, Page & Co.
RMRE378H–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON JUNCACE^ 239 On Luzula campestris, L. maxima, L. pilosa. Uredospores, May—July; teleutospores, September—November. (Fig. 184.). Fig. 184. P. oblongata. Teleutospores (one abnormal) and a mesospore; h, uredospores; all on same leaf of L. pilosa. The uredospores are said to be always smooth, more or less obovate, and often irregular. It is stated by Sydow that they can survive the winter. Fischer figures anomalous spores, of both kinds, including three- celled and one-celled teleutospores. Plowright's suggesti
RMPG44GG–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 394 GENERAL PLANT PATHOLOGY fibrovascular system of the cedar leaf (Fig. i6i). From, or near the base of the cedar apple, where the vascular elements are much con- torted, arise many branches, which extend radially almost to the cortex. Harshberger* has investigated the galls produced by two species of Gymnosporangium on the coastal white cedar, Chanuecyparis thyoides, and Stewart^ has published an account of the anatomy of Gymnosporangium galls and Peridermium gaUs. There may be an ove
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. THE LEAF-SMUT OF TIMOTHY. 41&. grasses, which are finally reduced to brown slireds, covered witli dusty si)ores. Tlio first ii])peiiriinco of tliis disease is in the formation of lead-colored, thickened lines, about l-O-i in. wide and 1-10 to J in. long, be- tween the nerves of tlie leaf. The epidermis, which at first covers Stock Photo](https://c8.alamy.com/comp/RJ6M7K/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-the-leaf-smut-of-timothy-41amp-grasses-which-are-finally-reduced-to-brown-slireds-covered-witli-dusty-siores-tlio-first-ii-peiiriinco-of-tliis-disease-is-in-the-formation-of-lead-colored-thickened-lines-about-l-o-i-in-wide-and-1-10-to-j-in-long-be-tween-the-nerves-of-tlie-leaf-the-epidermis-which-at-first-covers-RJ6M7K.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. THE LEAF-SMUT OF TIMOTHY. 41&. grasses, which are finally reduced to brown slireds, covered witli dusty si)ores. Tlio first ii])peiiriinco of tliis disease is in the formation of lead-colored, thickened lines, about l-O-i in. wide and 1-10 to J in. long, be- tween the nerves of tlie leaf. The epidermis, which at first covers Stock Photo")
RMRJ6M7K–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. THE LEAF-SMUT OF TIMOTHY. 41&. grasses, which are finally reduced to brown slireds, covered witli dusty si)ores. Tlio first ii])peiiriinco of tliis disease is in the formation of lead-colored, thickened lines, about l-O-i in. wide and 1-10 to J in. long, be- tween the nerves of tlie leaf. The epidermis, which at first covers
RMPG3NY1–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 347 Phyllosticta maculicola Hals.1 is the cause of a very common leaf spot of several species of Dracaena and Cordyline. The spots are characterized by pale centers an'd reddish or purplish borders. The disease is sometimes severe in greenhouses where it has long been allowed to proceed unchecked. It is, however, readily pre- vented by spraying with potassium sulfide solution. Phyllosticta Ampelopsidis Ell. & Mart, is perhaps closely related to the fungus causi
RMRE0RJK–. The mushroom book : a popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. The Relation of Fungi to Other Plants. Pistil of Pistil of violet St. Johns- wort Seed-box of iris learn with the microscope that the pond scums which he had thought disgusting frog-spittle are in truth tangles of exquisite plants, made up of chains of slender, transpar- ent cells finer than silken threads, each cell containing many tiny green par- ticles of leaf green, or chloro- phyll—the cause of
RMPG44RG–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. FUNGI IMPERKECTX (dEUTEROMYCETES) 261 groups of ASCOMYCETALES. Four families are included in this order, and these families include a considerable number of important genera of fungi, which specifically are the cause of important plant diseases. Phyllosticta is a genus, the species of which are confined to leaves, and they produce characteristic leaf spots on a great variety of plants. The specific name of the fungus is usually derived from that of the host plant attacked, as for exampl
RMRDYHCH–. The mushroom book : a popular guide to the identification and study of our commoner fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. Section to show gills All corn smuts, wheat smuts, leaf rusts, toadstools, puff- balls, and brackets bear their spores on club-like cells, and for this reason are put in one group, called Basidiomycetes. The fact that corn smuts and leaf rusts feed on living plants, while toad- stools, brackets, and puffballs feed on dead plants, separates them in- to two groups ; the smuts and rustsforming the lower
RMPG3P1W–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 3H FUNGOUS DISEASES OF PLANTS. Fig. 146. Cercospora Gossypina: an Isolation Culture XX. CERCOSPORA: OTHER SPECIES Parallel cultures on diverse culture media of a number of species on related hosts would be of special interest. As in the case of Phyllosticta, subse- quently discussed, numerous leaf spots are produced by members of this genus Cerco- spora. Very few cross inocula- tions have been made, and little is really known concerning the limitations of species. When the host pla
RMRDDWNG–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 120 PHYCoarrcETES. tufts, and form a white border round the brown parts of the leaf; they are monopodially branched and produce terminal sporangia (gonidia), which are easily detached. The sporangia on germination either pro- duce a varying number of zoospores, or germinate directly like conidia to form a mycelium capable of pro- ducing new conidia. The potato-disease is distin- guished from Phytophthora omnivora in
RMPG44KW–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 35° GENERAL PLANT PATHOLOGY red cedar by Gymnosporangmm juniperi-virginianm. The crown galls, or possible vegetal cancers, are another illustration of such excres- cences, while malformations are represented by peach leaf curl and the witches' brooms on trees. 12. Exudations.—The formation of slimy substances, which flow from trees and plants, the diseased conditions known as bacteriosis, •rummosis' and resinosis, illustrate the character of the exudations from. Fig. 139.—Burl, or enlar
RMRDDWJ6–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PERONOSPORA. 133 oospore-coat (oospores of P. viciae have a coat with a regular net- work). It occurs on stems, leaves, and petioles of clovers, lucerne and other Papilionaceae, often with disastrous effect. P. sparsa, Berk. (Britain and U.S. America). This parasite on the rose was first observed in England. It injures indoor roses, causing a fall of the leaf, preceded by the appearance of lilac-coloured spots which
RMPG3YDE–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 142. Effects of the Leaf-Spot Fungus: Prolonged Crown nearly upright, although some- what curled or rolled, present- ing a characteristic appearance in the field. Since the outer leaves are the first to succumb, the plant continues to develop new leaves from the bud, and the crown may thus become considerably elongated (Fig. 142), at a seri- ous sacrifice to root develop- ment, and probably at great loss to the sugar content. It has been stated by German observers that the lea
![. Plant world; its past, present & future; an introd. to the study of botany. Botany. CHAP. n.J CHEMISTRY, ETC., OF PLANT LIFE. 85 large group of cryptogamic plants called Lichens, that were until recently considered autonomous plants, as their relations, the Algae and Fungi, are in reality. It. Fig. 24. Illustrations of the life-cycle of the parasitic fungus known as "rust" on wheat and other grasses (Pueeinia grammis). I. the rust-coloured streaks of the fungus on stem and leaf of wheat plant (natural size); II. spore of the spring stage, known as uredospores (highly magnified) Stock Photo](https://c8.alamy.com/comp/RDHP2X/plant-world-its-past-present-amp-future-an-introd-to-the-study-of-botany-botany-chap-nj-chemistry-etc-of-plant-life-85-large-group-of-cryptogamic-plants-called-lichens-that-were-until-recently-considered-autonomous-plants-as-their-relations-the-algae-and-fungi-are-in-reality-it-fig-24-illustrations-of-the-life-cycle-of-the-parasitic-fungus-known-as-quotrustquot-on-wheat-and-other-grasses-pueeinia-grammis-i-the-rust-coloured-streaks-of-the-fungus-on-stem-and-leaf-of-wheat-plant-natural-size-ii-spore-of-the-spring-stage-known-as-uredospores-highly-magnified-RDHP2X.jpg ". Plant world; its past, present & future; an introd. to the study of botany. Botany. CHAP. n.J CHEMISTRY, ETC., OF PLANT LIFE. 85 large group of cryptogamic plants called Lichens, that were until recently considered autonomous plants, as their relations, the Algae and Fungi, are in reality. It. Fig. 24. Illustrations of the life-cycle of the parasitic fungus known as "rust" on wheat and other grasses (Pueeinia grammis). I. the rust-coloured streaks of the fungus on stem and leaf of wheat plant (natural size); II. spore of the spring stage, known as uredospores (highly magnified) Stock Photo")
RMRDHP2X–. Plant world; its past, present & future; an introd. to the study of botany. Botany. CHAP. n.J CHEMISTRY, ETC., OF PLANT LIFE. 85 large group of cryptogamic plants called Lichens, that were until recently considered autonomous plants, as their relations, the Algae and Fungi, are in reality. It. Fig. 24. Illustrations of the life-cycle of the parasitic fungus known as "rust" on wheat and other grasses (Pueeinia grammis). I. the rust-coloured streaks of the fungus on stem and leaf of wheat plant (natural size); II. spore of the spring stage, known as uredospores (highly magnified)
RMPG44R0–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. FUNGI IMPERFECTI (dEUTEROMYCETES) 267 fungus which causes leaf spot of beets, Cercospora beticola. The form genus Fusarium (Fig. 109), established by Link in 1809, is one which has come into prominence recently as associated with the production of serious plant diseases. At least eleven species are found on the sweet potato (Fig. 108), and these have been investigated by H. W. WoUenweber' and other mycologists. He finds that the genus has a number of vegetative and spore stages the vari
RMRDD8NA–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. DETAILED ACCOUNT OF SPECIFIC DISEASES OF PLANTS 481 truncate at the base and measure 28 to 30/i by 7 to 9/i. According to Clinton, they do not retain their vitality long. An investigation of perithecial formation indicates that perithecia begin to form in October, or even later, and reach maturity in the following April, when mature ascospores have been found especially on the under sur- faces of the leaves. They are im- bedded in the leaf tissues and are slightly pyriform in shape, inc
RMPG405F–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. SCHIZOMYCETES. BACTERIA 121 Pseudomonas malvacearum Erw. Smith. This parasite produces, through stomatal infections, water-soaked, angular areas (Fig. 30), known as angular leaf spot of cotton (Gossypium). Later these. ^sr^C:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Duggar, Benjamin M. (Benjamin Minge),
RMRDE4F3–. Minnesota plant diseases. Plant diseases. 124 Minnesota Plant Diseases. Pozi'dery mildezt's (Erysiphacecc). The mildews constitute the simplest group of black fungi. The mycelium is usually to be seen on the surface of leaves as a white, moldy covering. The threads send branches into the skin cells of the host and there absorb their food and live parasitically, btit the main my- celium of the fungus never lives inside of the host. In the y f ^ ' .'. ^'y .-^. ''^ â ^i if > â¢V4^ Fig. 50.âa powdery mildew on common plantain leaf. The powdery coat of tlie threads and the small black fruiting
RMPG4EK2–. Minnesota plant diseases. Plant diseases. 362 Minnesota Plant Diseases. palisade fashion on the surface of the pocket. Each sac contains about eight spores, which on germination may directly cause in- fection of a host plant. The fungus of this disease is very closely related to the peach leaf-curl fungus and to others forming witches'-broom on birch, alder and cherry trees. It is a sac- fungus with an arrangement of sacs similar to that in the true cup fungi, but has no true cup, since the sacs occur directly on the tissues of the host.. Fig. 193.—Plum pockets. These plums are devoid of sto
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. bt'CMi called Injyrosatjdc (iells. They iiro usually more or less wedge-sliap- ed, with the jjoiiit of the wedge towards w out- side of thelea^ In Zea mayx (Indian (^orn) these cells are raised Fio. 20.âThis illustrates the cross section at the . , , margin of a leaf of ^mp/jicarjJK/ii i^irWiif, shown in al)OVe the other cell Stock Photo](https://c8.alamy.com/comp/RJ6P5H/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-btcmi-called-injyrosatjdc-iells-they-iiro-usually-more-or-less-wedge-sliap-ed-with-the-jjoiiit-of-the-wedge-towards-w-out-side-of-thelea-in-zea-mayx-indian-orn-these-cells-are-raised-fio-20this-illustrates-the-cross-section-at-the-margin-of-a-leaf-of-mpjicarjjkii-iirwiif-shown-in-alove-the-other-cell-RJ6P5H.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. bt'CMi called Injyrosatjdc (iells. They iiro usually more or less wedge-sliap- ed, with the jjoiiit of the wedge towards w out- side of thelea^ In Zea mayx (Indian (^orn) these cells are raised Fio. 20.âThis illustrates the cross section at the . , , margin of a leaf of ^mp/jicarjJK/ii i^irWiif, shown in al)OVe the other cell Stock Photo")
RMRJ6P5H–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. bt'CMi called Injyrosatjdc (iells. They iiro usually more or less wedge-sliap- ed, with the jjoiiit of the wedge towards w out- side of thelea^ In Zea mayx (Indian (^orn) these cells are raised Fio. 20.âThis illustrates the cross section at the . , , margin of a leaf of ^mp/jicarjJK/ii i^irWiif, shown in al)OVe the other cell
RMPG3NJ0–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. AUTOBASIDIOMYCETES 441 distortions on young shoots of Andromeda lignstrina. Galls of this latter form are hollow, bag-like structures which may attain a length of five or six inches. Richards employed the large form on Andromeda and Exo- basidium Vaccinii in some cross inoculations and was able to develop the leaf spot form of the gall on Andromeda from Exo- basidium Vaccinii, and also to produce this same form through spores from the galls on Andromeda. He also directs attention t
RMRDC12K–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. EXOBASIDIUM. 425 from each a spindle-shaped spore is abjointed (Fig. 257). The basidiospores divide in water by formation of cross-septa, and a germ-tube arises from each terminal cell. On a young leaf of Vaccinmm the germ-tube penetrates and gives rise to a mycelium (Fig. 258); on other substrata the germ-tube sprouts into several very fine sterigmata, from the extremi- ties of which a series of conidia are abjoint
RMPG42HE–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 190 ASCOMYCETES. fertilise the trichogyne and cause it to develop as an ascogonium. P. ochraceum (Wahlenb.) {P. fulviom D. C.) causes yellowish- red spots on leaves of Prurnis Padios. P. obscurum Juel. produces thickened leaf-spots on Astragalus alpinus and A. oroboides; on the under side these are whitish, on the upper side they show the spermogonia as red points. The damage caused by Polystigma is easily kept in c
RMRDFDXW–. Manual of tree diseases . Trees. 242 MANUAL OF TREE DISEASES of many kinds of trees (Fig. 46). The second species Is a variety of the first, seemingly confined to eastern, southern and central United States, while the fom-th is so far reported only from California. All of these fungi cause powdery white patches on. Fig. 46. — Powdery mildew on oak leaf. both sides of leaves, but do little damage. The black or brown- ish fruiting-bodies can be seen scattered or in clusters over the affected area of the leaf. The life history and methods of con- trol of powdery mildew fungi are discussed on pa
RMPG3YDJ–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 3io FUNGOUS DISEASES OF PLANTS. Fig. 142. Effects of the Leaf-Spot Fungus: Prolonged Crown nearly upright, although some- what curled or rolled, present- ing a characteristic appearance in the field. Since the outer leaves are the first to succumb, the plant continues to develop new leaves from the bud, and the crown may thus become considerably elongated (Fig. 142), at a seri- ous sacrifice to root develop- ment, and probably at great loss to the sugar content. It has been stated
![. The care of trees, in lawn, street and park [microform] : with a list of trees and shrubs for decorative use. Trees; Jardins; Arbres; Landscape gardening. 42 Disease and Death of Trees â Generalities the wood body. While the tree can go on rotting for years, to all appearances without detriment, its stability is under- mined, and finally a windstorm may lay it low in full leaf and otherwise in full health. These fungi gain entrance to the wood through wounds made by Ircken or badly pruned branches, by broken bark or through injured, exposed roots. On the ragged surface of a broken branch stu Stock Photo](https://c8.alamy.com/comp/REN0EC/the-care-of-trees-in-lawn-street-and-park-microform-with-a-list-of-trees-and-shrubs-for-decorative-use-trees-jardins-arbres-landscape-gardening-42-disease-and-death-of-trees-generalities-the-wood-body-while-the-tree-can-go-on-rotting-for-years-to-all-appearances-without-detriment-its-stability-is-under-mined-and-finally-a-windstorm-may-lay-it-low-in-full-leaf-and-otherwise-in-full-health-these-fungi-gain-entrance-to-the-wood-through-wounds-made-by-ircken-or-badly-pruned-branches-by-broken-bark-or-through-injured-exposed-roots-on-the-ragged-surface-of-a-broken-branch-stu-REN0EC.jpg ". The care of trees, in lawn, street and park [microform] : with a list of trees and shrubs for decorative use. Trees; Jardins; Arbres; Landscape gardening. 42 Disease and Death of Trees â Generalities the wood body. While the tree can go on rotting for years, to all appearances without detriment, its stability is under- mined, and finally a windstorm may lay it low in full leaf and otherwise in full health. These fungi gain entrance to the wood through wounds made by Ircken or badly pruned branches, by broken bark or through injured, exposed roots. On the ragged surface of a broken branch stu Stock Photo")
RMREN0EC–. The care of trees, in lawn, street and park [microform] : with a list of trees and shrubs for decorative use. Trees; Jardins; Arbres; Landscape gardening. 42 Disease and Death of Trees â Generalities the wood body. While the tree can go on rotting for years, to all appearances without detriment, its stability is under- mined, and finally a windstorm may lay it low in full leaf and otherwise in full health. These fungi gain entrance to the wood through wounds made by Ircken or badly pruned branches, by broken bark or through injured, exposed roots. On the ragged surface of a broken branch stu
RMPG4G7P–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 225 elliptic, surrounded by a mucilaginous layer, 24-32 x 12-18 ju; paraphyses exceeding the asci. The mycelium produces rot of cranberries, also leaf spots, but the fructification of the fungus is rarely found in nature except on. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Stevens, Frank Lincoln, 1871-1934. New York : Ma
RMRDCY42–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 488 FUNGI IMPERFECTI. Faded spots appear on the leaves, becoming later greyish brown dotted over with minute black points, the couidial patches.' C. ampelinum Cav. causes little dry spots on the leaves of vine, fre- quently in such numbers that the whole leaf dries up. C. kentjae Hals, attacks palm-seedlings so that their leaves do not unfold. C. cyclameneae Hals, occurs on Cydamen. Scoleco-Allantosporae. Cylindrosp
RMPG3P1M–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 315 Padi, but it is important as an almond tree diseasel in California and elsewhere. Cercospora Nicotianae E. & E. The more commonly observed leaf spot or frog eye of the tobacco has been reported from many tobacco-growing regions, but does not appear to be a disease of. 6 Fig. 148. Cercospora circumscissa. (After Pierce) a, tuberculate stroma; &, conidiophores and conidia any great importance, and doubtless many different fungi are con- cerned in the prod
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fi(i.ril.—Sortion.tliroiiKli tlio midrtli'.of a leaf of ]'(ispal}irn pUcatiim, showlns frreg- >ilar epidermis and many bullifonu cells. 1 xT)*).—(Sudwortli.). Fig. S^i.—Pi. a transverse section of a li-af of Trnchiifmgnn poliimorphiw, showing small t^piderniai and very large bulliform cells. 1 xuO.—(Sudworth.). Please note tha Stock Photo](https://c8.alamy.com/comp/RJ6P1A/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-fiirilsortiontliroiikli-tlio-midrtliof-a-leaf-of-ispalirn-pucatiim-showlns-frreg-gtilar-epidermis-and-many-bullifonu-cells-1-xtsudwortli-fig-sipi-a-transverse-section-of-a-li-af-of-trnchiifmgnn-poliimorphiw-showing-small-tpiderniai-and-very-large-bulliform-cells-1-xuosudworth-please-note-tha-RJ6P1A.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fi(i.ril.—Sortion.tliroiiKli tlio midrtli'.of a leaf of ]'(ispal}irn pUcatiim, showlns frreg- >ilar epidermis and many bullifonu cells. 1 xT)*).—(Sudwortli.). Fig. S^i.—Pi. a transverse section of a li-af of Trnchiifmgnn poliimorphiw, showing small t^piderniai and very large bulliform cells. 1 xuO.—(Sudworth.). Please note tha Stock Photo")
RMRJ6P1A–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fi(i.ril.—Sortion.tliroiiKli tlio midrtli'.of a leaf of ]'(ispal}irn pUcatiim, showlns frreg- >ilar epidermis and many bullifonu cells. 1 xT)*).—(Sudwortli.). Fig. S^i.—Pi. a transverse section of a li-af of Trnchiifmgnn poliimorphiw, showing small t^piderniai and very large bulliform cells. 1 xuO.—(Sudworth.). Please note tha
RMPG3YE1–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 3o8 FUNGOUS DISEASES OF PLANTS of Bordeaux mixture, so that the ordinary strength may be used without causing any trouble. In the case of the early sprayings in the spring when there is apt to be cold weather, it has been found that plants will sometimes be injured by the Bordeaux. If care is taken not to apply the mixture just before a hard freeze, little trouble will result. Alternaria Violae Gall. & Dorsettx produces a leaf spot of violets in the greenhouse, particularly whe
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 20.—A section of Festuca uigantca, Hiinilar to tho previous llKure. 1 y !*).— (Hiicliel). T°. The leaves of Leernia ori/zuu/cs (rico cut-grusH), luivu nu- nuTous bunds of bulliform cells on the upper surface, each side of the middle, and one band each side of the keel on the lower side.. Fio. 27.—Transverse section of a leaf Stock Photo](https://c8.alamy.com/comp/RJ6P3E/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-fio-20a-section-of-festuca-uigantca-hiinilar-to-tho-previous-llkure-1-y-!-hiicliel-t-the-leaves-of-leernia-orizuucs-rico-cut-grush-luivu-nu-nutous-bunds-of-bulliform-cells-on-the-upper-surface-each-side-of-the-middle-and-one-band-each-side-of-the-keel-on-the-lower-side-fio-27transverse-section-of-a-leaf-RJ6P3E.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 20.—A section of Festuca uigantca, Hiinilar to tho previous llKure. 1 y !*).— (Hiicliel). T°. The leaves of Leernia ori/zuu/cs (rico cut-grusH), luivu nu- nuTous bunds of bulliform cells on the upper surface, each side of the middle, and one band each side of the keel on the lower side.. Fio. 27.—Transverse section of a leaf Stock Photo")
RMRJ6P3E–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 20.—A section of Festuca uigantca, Hiinilar to tho previous llKure. 1 y !*).— (Hiicliel). T°. The leaves of Leernia ori/zuu/cs (rico cut-grusH), luivu nu- nuTous bunds of bulliform cells on the upper surface, each side of the middle, and one band each side of the keel on the lower side.. Fio. 27.—Transverse section of a leaf
RMPG3YT2–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 203 XII. MOLLISIACE^E This family differs from the Helotiaceae largely in texture, the former being tougher, and as a rule made up of hyphal cells modified in a prosenchymatic or fibrous manner. The spores are hyaline and very similar to those of the Helotiacese. The only genus of importance in producing plant diseases is Pseudopeziza.. Fig. 77 a. Alfalfa Leaf Spot. (Photograph by H. H. Whetzel) Pseudopeziza. In this genus the apothecium is formed beneath the epidermis,
RMRDD7YC–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. UROCYSTIS. 315 Urocystis occulta (Wallr.). (Britain and U.S. America.) This species is common on the haulms, leaves, leaf-sheaths, and less commonly on floral parts of Secale cereale (rye). It causes the. Fig. 172.—Urocystis occulta on Rye. The ears are stunted, and the spore- powder emerges frpm longitudinal fissures in the upper part of the stems, (v. Tubeuf phot.) formation of grey stripes, from which a black spo
RMPG3YX3–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 177 this point. Ninety-two per cent believed that a cold spring is favorable to the disease; more than seventy-five believed the wet weather also to be a factor. Six and seventeen per cent, respec- tively, expressed opinions opposing the view that cold and mois- ture are influencing factors. The memorable leaf-curl years in New York and Ohio, 1893, 1897, and 1898, were preceded by. Fig. 64. Peach Leaf Curl cold and humid conditions during April, the time when the buds n
RMRDJ65W–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 357 Control. It appears that the only practical methods of prevent- ing this disease are to obtain healthy plants at the outset, to avoid planting where raspberries or other related plants have grown, and to remove and burn old canes as promptly as possible. The results with spraying have not thus far been successful. XLVIII. ROSE LEAF BLOTCH Actinonema Rosa (Lib.) Fr. Cobb, N. A. Black Spot of the Rose. Dept. Agl. N. S. Wales. Miscel. Publ. (2d Ser.) 6661 2-27. //
![. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 485 P. tabifica Prill is perhaps identical with Myeosphserella tabifica, though Potebnia" questions this. See p. 247. P. maculiformis (Pers.) Sacc. on chestnut =Mycosph£erella maculiformis. See p. 249. P. soUtaria E. & E.^-« Perithecia minute, immersed, the ostiole only erumpent; conidia broadly elliptic, 8-10 x 5-6 m, surrounded by a mucilaginous sheath. It is the cause of apple fruit blotch and of cankers and leaf spots. On the fruit it was first reported by Clinton ^ in 1902. The frui Stock Photo](https://c8.alamy.com/comp/PG0RC1/the-fungi-which-cause-plant-disease-plant-diseases-fungi-the-fungi-which-cause-plant-disease-485-p-tabifica-prill-is-perhaps-identical-with-myeosphserella-tabifica-though-potebniaquot-questions-this-see-p-247-p-maculiformis-pers-sacc-on-chestnut-=mycospherella-maculiformis-see-p-249-p-soutaria-e-amp-e-perithecia-minute-immersed-the-ostiole-only-erumpent-conidia-broadly-elliptic-8-10-x-5-6-m-surrounded-by-a-mucilaginous-sheath-it-is-the-cause-of-apple-fruit-blotch-and-of-cankers-and-leaf-spots-on-the-fruit-it-was-first-reported-by-clinton-in-1902-the-frui-PG0RC1.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 485 P. tabifica Prill is perhaps identical with Myeosphserella tabifica, though Potebnia" questions this. See p. 247. P. maculiformis (Pers.) Sacc. on chestnut =Mycosph£erella maculiformis. See p. 249. P. soUtaria E. & E.^-« Perithecia minute, immersed, the ostiole only erumpent; conidia broadly elliptic, 8-10 x 5-6 m, surrounded by a mucilaginous sheath. It is the cause of apple fruit blotch and of cankers and leaf spots. On the fruit it was first reported by Clinton ^ in 1902. The frui Stock Photo")
RMPG0RC1–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 485 P. tabifica Prill is perhaps identical with Myeosphserella tabifica, though Potebnia" questions this. See p. 247. P. maculiformis (Pers.) Sacc. on chestnut =Mycosph£erella maculiformis. See p. 249. P. soUtaria E. & E.^-« Perithecia minute, immersed, the ostiole only erumpent; conidia broadly elliptic, 8-10 x 5-6 m, surrounded by a mucilaginous sheath. It is the cause of apple fruit blotch and of cankers and leaf spots. On the fruit it was first reported by Clinton ^ in 1902. The frui
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 27.—Transverse section of a leaf of Lecrxia oruzintlcx (rice ciit-Krass), showinar lateral bands of bulliforiii cells on liie upper side,ana one lateral band below on eacli side of tlie keel. 1 x :t,jO.—(Duval-Jouvc'). 8°. Tlie leaves of Ainphicdrpuni Purshii and others, have opposite bands of bulliform cells on both surface Stock Photo](https://c8.alamy.com/comp/RJ6P31/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-fio-27transverse-section-of-a-leaf-of-lecrxia-oruzintlcx-rice-ciit-krass-showinar-lateral-bands-of-bulliforiii-cells-on-liie-upper-sideana-one-lateral-band-below-on-eacli-side-of-tlie-keel-1-x-tjoduval-jouvc-8-tlie-leaves-of-ainphicdrpuni-purshii-and-others-have-opposite-bands-of-bulliform-cells-on-both-surface-RJ6P31.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 27.—Transverse section of a leaf of Lecrxia oruzintlcx (rice ciit-Krass), showinar lateral bands of bulliforiii cells on liie upper side,ana one lateral band below on eacli side of tlie keel. 1 x :t,jO.—(Duval-Jouvc'). 8°. Tlie leaves of Ainphicdrpuni Purshii and others, have opposite bands of bulliform cells on both surface Stock Photo")
RMRJ6P31–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 27.—Transverse section of a leaf of Lecrxia oruzintlcx (rice ciit-Krass), showinar lateral bands of bulliforiii cells on liie upper side,ana one lateral band below on eacli side of tlie keel. 1 x :t,jO.—(Duval-Jouvc'). 8°. Tlie leaves of Ainphicdrpuni Purshii and others, have opposite bands of bulliform cells on both surface
RMPG3YRW–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 204 FUNGOUS DISEASES OF PLANTS. Fig. 77 b. Alfalfa defoliated by the Leaf Spot Fungus. (Photo- graph by H. H. Whetzel) Small sooty brown or black spots about -X- inch in diameter are 1 D produced, first evident on the upper surfaces of the leaves (Fig. 78). In these spots there appear later in the season the relatively simple, sessile apothecia, which are formed beneath the epidermis and break through at maturity. The spots are often very numer- ous, causing defoliation of many of
RMRDED2M–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 390 UREDINEAE. In May or June the cushions swell up and become large brownish-yellow gelatinous clumps, dotted over with dark points, the teleutospores. Promycelia arise from one or more germ- pores in each spore, and give off basidia with sporidia (basidio-. FiG. 224.—Aecidia and Pycnidia of various species of Gyninosporangium : G. tremetloides—1 and S, aecidia on leaf of Pyrvs Ai-ia ; 5 and 6, aecidia on leaf of P
RMPG14JM–. Manual of tree diseases . Trees. MAPLE DISEASES 227 In wet seasons defoliation may result. The illustrations show the effect of these diseases on the leaf (Figs. 37 and 38). Many of the other leaf-spots of maple appear similar to these, however, and no accurate determination can be made without a microscopic ex- amination of the fungus. The leaf-spot caused by Phyllo- sticta minima is characterized by light brown cir- cular spots with numerous black dot-like fruiting- bodies near the center (Fig. 37). The general char- acters of leaf- spots, and the life history of the fungi causing them, ar
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 3.).—A portion of a cross section of a leaf ot P/i/eum prafed.sc (Timothy), show ins bands of bulllform cells on each side the middle, and others between the veins, 1 X 20.—(Sudworth.) 5*- The leaves of Phleum 2^ratenxe{^moty), and many others have one band of several shallow cells each side the middle, and others between Stock Photo](https://c8.alamy.com/comp/RJ6P47/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-fio-3a-portion-of-a-cross-section-of-a-leaf-ot-pieum-prafedsc-timothy-show-ins-bands-of-bulllform-cells-on-each-side-the-middle-and-others-between-the-veins-1-x-20sudworth-5-the-leaves-of-phleum-2ratenxemoty-and-many-others-have-one-band-of-several-shallow-cells-each-side-the-middle-and-others-between-RJ6P47.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 3.).—A portion of a cross section of a leaf ot P/i/eum prafed.sc (Timothy), show ins bands of bulllform cells on each side the middle, and others between the veins, 1 X 20.—(Sudworth.) 5*- The leaves of Phleum 2^ratenxe{^moty), and many others have one band of several shallow cells each side the middle, and others between Stock Photo")
RMRJ6P47–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fio. 3.).—A portion of a cross section of a leaf ot P/i/eum prafed.sc (Timothy), show ins bands of bulllform cells on each side the middle, and others between the veins, 1 X 20.—(Sudworth.) 5*- The leaves of Phleum 2^ratenxe{^moty), and many others have one band of several shallow cells each side the middle, and others between
RMPG45HA–. The fungi which cause plant disease . Plant diseases; Fungi. 608 THE FUNGI WHICH CAUSE PLANT DISEASE S. graminis Fcl. Spots foliicolous, elongate, ochraceous; conidiophores densely fasciculate, filiform, simple, sinuose, 90-100 x 6-8 n, subcontinuous; conidia fusoid-obclavate, 35-45 X 8-10 n, miiseptate, olive-brown. It is common, causing leaf spots on grasses, especially on Avena and Phleum. It is de- scribed on the latter by Trelease.''^ The my- celitmi collects below the stomata and pushes its tuft of hyphae through them. S. melophthorum P. & D. parasitizes melons and cucumbers in Fra
RMRE2NK8–. Elementary botany. Botany. HOW PLAXTS OBTAIN FOOD. 87 of these plants wliich are known as parasitic fungi. Tlie plant at whose expense tliey grow is called the ^'jLosiS' One of these parasitic fungi, which it is quite easy to obtain in green- houses or conservatories during tlie autumn and wdnter, is the carnation rust {C'7-o}fiyt-s cayvophvilinus), since it Vjreaks out in rust)' dark Vjrown patches on the leaves and stems of the carnatinn (see fig. 75). If we make thin cross sections through one of these spots on a leaf, and place them for a Fig. 76. Several teleutospores, sho^^'ing the va
RMPG45HF–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 605 conidia elliptic-oblong, 1-septate, translucent, tawny, 10-20 x 4- 6m. The hyphse are abundant on the lower sides of tomato leaves, forming a mold, varying from whitish to purplish in color. It causes serious disease in Europe and America. C. condylonema Pass, is found on leaves of Prunus causing leaf spot and curl. C. bigarardia is on Citrus. C. macrocarpum Preu.^ Subeffuse, black; conidiophores subfasciculate, simple, some-. FiG. 407.—C. fulvum. After Southworth. what flexuose, brown; conid
RMRDJG38–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. SCHIZOMYCETES. BACTERIA 109 t are affected they may be killed. Any affected plants are prey to saprophytic organisms, and an offensive soft rot is then likely to result. Whether in the leaves or in the stem, the course of the. Fig. 24. A Cabbage Leaf with Black Rot developing from Water Pore Infections. (Photograph by F. C. Stewart and H. A. Harding) disease may usually be traced by a darkening of the fibrovascular bundles. Fig. 23 shows a healthy and a diseased plant, the latter a
RMPG3YDR–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECT! 309 XVII. LEAF SPOT OF BEETS Cercospora Beticola Sacc. Duggar, B. M. Leaf Spot of the Beet. Cornell Agl. Exp. Sta. Built. 163: 352-359- figs. 56-61. 1898. Pammel, L. H. Spot Disease of Beets. Iowa Agl. Exp. Sta. Built. 15: 238- 243. 1891. Habitat relations. The beet leaf spot is widely distributed. Both in Europe and America it is a fungus of common occurrence, and it is believed to be more or less prevalent wherever beets are grown even to a limited extent. The re
RMRDC0KJ–. Manual of fruit diseases . Fruit. 440 MANUAL OF FRUIT DISEASES the leaf or the fruit and produces infection during the rain, not before nor after. Get the fungicide on ahead of the rain and thus ahead of the fungus. Watch the weather maps and the develop- ing blossoms. It will be more prof- itable in some cases to spray a little before the host is in just the right condition in order to get in ahead of a rain- period. Long, rainy, cloudy periods are the dangerous ones. Heavy showers followed by rapid clearing seldom afford conditions favorable to serious infection by orchard fungi. The perio
RMPG45GE–. The fungi which cause plant disease . Plant diseases; Fungi. 622 THE FUNGI WHICH CAUSE PLANT DISEASE flask-shaped, strongly constricted at the septa, olive, 40-60 x 10-17 n. Circular leaf-spots are produced on violets. Spores are found on the spots only when conditions are most favorable, i. e., in a humid air. The parasitism of the fungus was demonstrated by inocula- tion with spores on living leaves in distilled water. A. panax Whet.^^e Spots amphigenous, circular, becoming dingy white with a. Fig. 420.—Alter- n a r i a. Spores and spore-bear- ing stalks. Af- ter van Hook.. Please note tha
RMRDDBF4–. The fungi which cause plant disease . Plant diseases; Fungi. FiQ. 159.—^A single perithecium of A. vaccinii taken from a pure culture on corn meal. After Shear. Fig. 160.—Acan- thorhynchus; a germinating as- cospore bearing the peculiar appressorium, 17, view from above. After Shear. old fallen leaves. In culture, however, it produces abundant peri- thecia. When on the leaf the perithecia are subepidermal and are sparsely scattered over the lower surface. No conidial or pycnidial form is known. Remarkable appressoria are produced by the germ tubes from the spores, Fig. 160. Sphseriacese (p.
RMPG4055–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ^sr^C:. Fig. 30. Angular Leaf Spot of Cotton. (Photograph by Erwin F. Smith) spots turn purple and finally become dry and brown. The disease is apparently widely distributed in the southern states, but the organism has not yet been fully described.1 X. PEAR BLIGHT Bacillus amylovorus (Burrill) De Toni Arthur, J. C. Diseases of the Pear. N. Y. Agl. Exp. Sta. Rept. 3: 357-367. 1884. Arthur, J. C. History and Biology of Pear Blight. Proc. Phil. Acad. Nat. Sci. (1886): 322-341. pi. 3.
RMRE36Y5–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. GYMNOSPORANGIUM 305 JEcidiospores. iEcidia clustered on yellow or orange thick- ened spots on the leaves, fruits, and stems, cylindrical, up to. Fig. 230. G. clavariaeforme, .^cidia (Eoeatelia) on leaf, fruit and branch of Hawthorn (reduced); a, peridium x 16. The fruit and gall on branch are shown as tliey appear when the peridia are old and the mass looks some- what like a honey-comb. 2| mm. high, fimbriate above, at length lacerate to base, pale- brown ; spores verruculose, brownish, about 28—30 fi; pores 8—
RMPG46A0–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 277 globose, with a short, conical ostiole, walls black, carbonous to leathery; asci cylindric, 8-spored; spores elliptic, continuous, brown, imappendaged; paraphyses usually present. Over one hundred species, chiefly sapro- phytes. A. sullae Montem. occurs as the cause of a leaf spot on sulla.^** Fig. 206.—a. des- A. bohiensis (Hmp.) Speg. is on cacao; Z^g,I'^^ut^^S; A. destruens Sh. on cranberry; spores; 11, germi- Dating spore. After A. coffese Desm. on coffee.™* ^^ Shear. Valsaceae (p. 223) S
RMRDW8E8–. The mushroom book : a popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. Pouch-fungus section, to show- spores in hollow rind. Section to show gills All corn smuts, wheat smuts, leaf rusts, toadstools, puff- balls, and brackets bear their spores on club-like cells, and for this reason are put in one group, called Basidiomycetes. The fact that corn smuts and leaf rusts feed on living plants, while toad- stools, brackets, and puffballs feed on dead plants, separates them in
![. The fungi which cause plant disease . Plant diseases; Fungi. 628 THE FUNGI WHICH CAUSE PLANT DISEASE C. apii Fr. Spots amphigenous, subcircular, pale-brown, 4-6 mm. in diame- ter, with a more or less definite elevated margin; conidiophores hy- pophylous, light-brown, fasciculate, con- tinuous or 1 or 2-septate, subundulate, 40-60 X 4-5 n; conidia hyaline obclavate, or almost cylindric, 3 to 10-septate, slen- der, 50-80 xi II. A serious leaf spot is produced on celery, parsnips, etc.'^""'^^ C. beticola Sacc."' ^sa Spots amphigenous, brownish, purple- bordered, becoming ashy cen Stock Photo](https://c8.alamy.com/comp/PG45G6/the-fungi-which-cause-plant-disease-plant-diseases-fungi-628-the-fungi-which-cause-plant-disease-c-apii-fr-spots-amphigenous-subcircular-pale-brown-4-6-mm-in-diame-ter-with-a-more-or-less-definite-elevated-margin-conidiophores-hy-pophylous-light-brown-fasciculate-con-tinuous-or-1-or-2-septate-subundulate-40-60-x-4-5-n-conidia-hyaline-obclavate-or-almost-cylindric-3-to-10-septate-slen-der-50-80-xi-ii-a-serious-leaf-spot-is-produced-on-celery-parsnips-etcquotquot-c-beticola-saccquot-sa-spots-amphigenous-brownish-purple-bordered-becoming-ashy-cen-PG45G6.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. 628 THE FUNGI WHICH CAUSE PLANT DISEASE C. apii Fr. Spots amphigenous, subcircular, pale-brown, 4-6 mm. in diame- ter, with a more or less definite elevated margin; conidiophores hy- pophylous, light-brown, fasciculate, con- tinuous or 1 or 2-septate, subundulate, 40-60 X 4-5 n; conidia hyaline obclavate, or almost cylindric, 3 to 10-septate, slen- der, 50-80 xi II. A serious leaf spot is produced on celery, parsnips, etc.'^""'^^ C. beticola Sacc."' ^sa Spots amphigenous, brownish, purple- bordered, becoming ashy cen Stock Photo")
RMPG45G6–. The fungi which cause plant disease . Plant diseases; Fungi. 628 THE FUNGI WHICH CAUSE PLANT DISEASE C. apii Fr. Spots amphigenous, subcircular, pale-brown, 4-6 mm. in diame- ter, with a more or less definite elevated margin; conidiophores hy- pophylous, light-brown, fasciculate, con- tinuous or 1 or 2-septate, subundulate, 40-60 X 4-5 n; conidia hyaline obclavate, or almost cylindric, 3 to 10-septate, slen- der, 50-80 xi II. A serious leaf spot is produced on celery, parsnips, etc.'^""'^^ C. beticola Sacc."' ^sa Spots amphigenous, brownish, purple- bordered, becoming ashy cen
![. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fig. 43.—Section of a blade of a leaf of Festucu ovhut var. loBvis, with a Kronp of hypodermal fibers below the mid-vein, and one at each margin of the leaf. I x 30.—(Hackel.) Fio. 44.—Section of the blade of Foituca orina, witli hypodermal fibers extending over the lower side. 1x30.—(Huekel.) Fio. 45. —Seet ion of a leaf of Feti Stock Photo](https://c8.alamy.com/comp/RJ6NPY/grasses-of-north-america-microform-chapters-on-the-physiology-composition-selection-improving-and-cultivation-of-grasses-management-of-grass-lands-also-chapters-on-clovers-injurious-insects-and-fungi-grasses-forage-plants-gramines-plantes-fourragres-fig-43section-of-a-blade-of-a-leaf-of-festucu-ovhut-var-lobvis-with-a-kronp-of-hypodermal-fibers-below-the-mid-vein-and-one-at-each-margin-of-the-leaf-i-x-30hackel-fio-44section-of-the-blade-of-foituca-orina-witli-hypodermal-fibers-extending-over-the-lower-side-1x30huekel-fio-45-seet-ion-of-a-leaf-of-feti-RJ6NPY.jpg ". Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fig. 43.—Section of a blade of a leaf of Festucu ovhut var. loBvis, with a Kronp of hypodermal fibers below the mid-vein, and one at each margin of the leaf. I x 30.—(Hackel.) Fio. 44.—Section of the blade of Foituca orina, witli hypodermal fibers extending over the lower side. 1x30.—(Huekel.) Fio. 45. —Seet ion of a leaf of Feti Stock Photo")
RMRJ6NPY–. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. Fig. 43.—Section of a blade of a leaf of Festucu ovhut var. loBvis, with a Kronp of hypodermal fibers below the mid-vein, and one at each margin of the leaf. I x 30.—(Hackel.) Fio. 44.—Section of the blade of Foituca orina, witli hypodermal fibers extending over the lower side. 1x30.—(Huekel.) Fio. 45. —Seet ion of a leaf of Feti
RMPG46EM–. The fungi which cause plant disease . Plant diseases; Fungi. 246 THE FUNGI WHICH CAUSE PLANT DISEASE. FiQ. 180.—M. sentina, Septona stage. Portion of a section through a pear leaf spot, showing e, e, epidermis; p, pali- sade cells sp, spongy parenchyma; o, S. piricola pycnidium, giving out spores, b. After Longyear. M. sentina (Fr.) Schr. Perithecia, 80-110 /i; on dead spots of leaves, the long ostiole erumpent; asci clavate, 60-75 x 11-13 fi, colorless; spores fusiform, curved or straight, 26-33 x Conidia (=Septoria piricola) borne in pycnidia which are similar in size and form to the perit
RMRDE2A2–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 2IO MYCOLOGY scattered, or aggregated and its aecia on seven species of Amelanchier, one each of Aronia and Cydonia. Gymnosporangium Ellisii (Figs. 74 and 75) in its telial form distorts the younger branches of the white cedar, Chamacyparis thyoides, pro-. FiG. 80.—RoesteUa, or fficia on apple leaf. (After Giddings and Berg, Bull 257 Agric. Exper. Stat. Univ. Wise, July, 1915.) ducing numerous fasciations. The «cia and pycnia of this fungus are on Myrica. Gymnosporangium globosum is rem
RMRDE4Y7–. The fungi which cause plant disease . Plant diseases; Fungi. Fia. 416.—Sporodesmium antiquum. After Sac- caxdo. S. exitiosum var. solani Schenck is reported as the cause of a potato disease. S. solani-varians Yanha is the cause of potato disease in Europe, the foliage bearing brown spots and finally dying in a manner resembling death caused by Phytophthora. Cladosporium and pycnidial forms are said to exist. S. mucosum Sacc. was reported by Ader- holt on cucumber fruit and leaves causing disease. S. scorzonerae Aderh. causes a salsify stem and leaf disease.'^* Other parasitic species are: S.
RMRE2G7C–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 248. 0. Sorbi. Jicid- ium leucospermum. a, aecidia on leaf of A. nemorosa, nat. size; 6, the same, x 2 ; u, secidiospores, x 600.. Fig. 249. 0. Sorbi. Section of teleuto-sorus, before tlie division of the spores into four cells (one spore is shaded); «,, basidiospores. (After Fischer.) Teleutospores. Sori hypophyllous, ^—^ mm. diam., at first covered by the epidermis, pustulate, pale flesh-colour, roundish or oblong, clustered in groups; spores cylindrical, rounded above, crowded, grey, granular, subopaque
![. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fia. 49.—ExotLscus pruni. Miilforraed Plums—"pocket plums" ; one which is cut shows the rudimentary stoue. ^ natural size. (v. Tubeuf phot.) Fig. 50.—Exoascus pruni on twig of Prunus Padua (at end of July). Four of the ovaries- are malformed, (v. Tuheuf deL). Fig. 51.—Exoascus pintni. Young twigs of Plum, showing effects of mycelium. The shoots are swollen and distorted, one diseased leaf remains hypertrop Stock Photo](https://c8.alamy.com/comp/RDC2EW/diseases-of-plants-induced-by-cryptogamic-parasites-introduction-to-the-study-of-pathogenic-fungi-slime-fungi-bacteria-amp-algae-plant-diseases-parasitic-plants-fungi-fia-49exotlscus-pruni-miilforraed-plumsquotpocket-plumsquot-one-which-is-cut-shows-the-rudimentary-stoue-natural-size-v-tubeuf-phot-fig-50exoascus-pruni-on-twig-of-prunus-padua-at-end-of-july-four-of-the-ovaries-are-malformed-v-tuheuf-del-fig-51exoascus-pintni-young-twigs-of-plum-showing-effects-of-mycelium-the-shoots-are-swollen-and-distorted-one-diseased-leaf-remains-hypertrop-RDC2EW.jpg ". Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fia. 49.—ExotLscus pruni. Miilforraed Plums—"pocket plums" ; one which is cut shows the rudimentary stoue. ^ natural size. (v. Tubeuf phot.) Fig. 50.—Exoascus pruni on twig of Prunus Padua (at end of July). Four of the ovaries- are malformed, (v. Tuheuf deL). Fig. 51.—Exoascus pintni. Young twigs of Plum, showing effects of mycelium. The shoots are swollen and distorted, one diseased leaf remains hypertrop Stock Photo")
RMRDC2EW–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fia. 49.—ExotLscus pruni. Miilforraed Plums—"pocket plums" ; one which is cut shows the rudimentary stoue. ^ natural size. (v. Tubeuf phot.) Fig. 50.—Exoascus pruni on twig of Prunus Padua (at end of July). Four of the ovaries- are malformed, (v. Tuheuf deL). Fig. 51.—Exoascus pintni. Young twigs of Plum, showing effects of mycelium. The shoots are swollen and distorted, one diseased leaf remains hypertrop
RMRE3B42–. Practical botany. Botany. THE ALGvE-FUNGI (PHYCOMYCETES) 221 (haustoria), wliich absorb food directly from the cell contents of the host (Fig. 181, 5). When the mildew has thus grown within the leaf for a time, it sends through the stomata on the under surface numer- ous branches which consti- tute the super- ficial downy patches char- acteristic of the parasite. 211. Grape mildew: asex- ual reproduction. Some of the aerial hyphse branch and upon tips of these branches produce spore-like bodies, the conidia (Fig. 181, A). These conidia fall from the conidiophores (conidia bear- ers), and whe
RMRDEXHY–. Minnesota plant diseases. Plant diseases. 162 Minnesota Plant Diseases. the cluster-cup stage or rather just preceding it one very often finds another accessory spore-form in which small spore-cases of pear-shaped structure are produced, sunken into the oppo- site—usually upper—side of the leaf from that on which the cluster cup occurs. Inside of these pear-shaped cases the spores are produced on long threads from which they are pinched ofif just as in very similar structures found in many of the acces- sory spore-forms of the sac fungi. These spores are often ac- companied by the production
RMRE0REF–. The mushroom book : a popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. Pouch-fungus section, to show- spores in hollow rind. Section to show gills All corn smuts, wheat smuts, leaf rusts, toadstools, puff- balls, and brackets bear their spores on club-like cells, and for this reason are put in one group, called Basidiomycetes. The fact that corn smuts and leaf rusts feed on living plants, while toad- stools, brackets, and puffballs feed on dead plants, separates them in
![. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON COMPOSITE 157 ^cidiospores. ^cidia hypophyllous, evenly spread over the whole leaf-surface, flat, with white margia; spores delicately verruculose, yellowish, 15—25 x 14—20 fj..] Uredospores. Sori amphigenous, minute, roundish, scat- tered, surrounded by the epidermis, cin- namon; spores globose to ovoid, delicately aculeate, brown, 20—24 x 16—20 /j,, with two or three germ-pores. Teleutospores. Sori hypophyllous, rarely also epiphyllous, minute, long covered by the epidermis,blackish-brown; Fig. 108. P. Cre Stock Photo](https://c8.alamy.com/comp/RE37TF/the-british-rust-fungi-uredinales-their-biology-and-classification-rust-fungi-on-composite-157-cidiospores-cidia-hypophyllous-evenly-spread-over-the-whole-leaf-surface-flat-with-white-margia-spores-delicately-verruculose-yellowish-1525-x-1420-fj-uredospores-sori-amphigenous-minute-roundish-scat-tered-surrounded-by-the-epidermis-cin-namon-spores-globose-to-ovoid-delicately-aculeate-brown-2024-x-1620-j-with-two-or-three-germ-pores-teleutospores-sori-hypophyllous-rarely-also-epiphyllous-minute-long-covered-by-the-epidermisblackish-brown-fig-108-p-cre-RE37TF.jpg ". The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON COMPOSITE 157 ^cidiospores. ^cidia hypophyllous, evenly spread over the whole leaf-surface, flat, with white margia; spores delicately verruculose, yellowish, 15—25 x 14—20 fj..] Uredospores. Sori amphigenous, minute, roundish, scat- tered, surrounded by the epidermis, cin- namon; spores globose to ovoid, delicately aculeate, brown, 20—24 x 16—20 /j,, with two or three germ-pores. Teleutospores. Sori hypophyllous, rarely also epiphyllous, minute, long covered by the epidermis,blackish-brown; Fig. 108. P. Cre Stock Photo")
RMRE37TF–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON COMPOSITE 157 ^cidiospores. ^cidia hypophyllous, evenly spread over the whole leaf-surface, flat, with white margia; spores delicately verruculose, yellowish, 15—25 x 14—20 fj..] Uredospores. Sori amphigenous, minute, roundish, scat- tered, surrounded by the epidermis, cin- namon; spores globose to ovoid, delicately aculeate, brown, 20—24 x 16—20 /j,, with two or three germ-pores. Teleutospores. Sori hypophyllous, rarely also epiphyllous, minute, long covered by the epidermis,blackish-brown; Fig. 108. P. Cre
RMRDC1H4–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fig. 130.—Sections of Maple leaves showing the upper epidermis ruptured by 1, RKytisma acerinwm; 2, Rhytisma 2mnctatum. Fig. 131.—Rhytisma symvietricum Miill. Two leaves of Salix purpurea vrith stromata. A, The upper side. B, The lower side. C, Longitudinal section through the same leaf, showing numerous apothecia on the upper side, fewer on the lower ; the shaded middle part represents leaf-tissue, the remainder is
RMRPY27N–. Hawaiian Fungi. Fungi. Stevens—Hawaiian Fungi 47 places and the entire mesophyll of the leaf in a diseased area is penetrated, though but sparsely, by the mycelium.. Figure; io.—Meliolineae: a, Meliolinasyndowiana—setum showing branching, mycelium with vestigial haustoria, and mycelium within the host tissue; b and cs Amazonia: b, A. perrottetiae (No. 717a) on Perrottetia sandwicensis— mycelium with angular hyphopodia, also spores; c, A. psychotriae (No, 610) on Wikstroemia, showing edge of a colony with free myce- lium bearing alternate hyphopodia. 31. AMAZONIA Theis. Ann. Myc, vol. 11, p.
RMRDE564–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 555 Melanconiacese-Hyalodidymse (p. 537) Conidia hyaline, 1-septate, ovoid to fusoid. Key to Gexeba of Melanconiaces-Hyalodidymse Conidia mutic Saprophjrtic, on stems and fruits 1. Septomyza. Biogenous, typically on leaves 2. Marssonia, p. 555. Conidia 3 to 4-ciliate at each end 3. GlGesporiella. Marssonia Fisch Acervuli globose-discoid, pale, conidia ovate to elongate. In part =Gnomonia, Trochila, Pseudopesiza. Some seventy-five species, all leaf parasites, several of eco- nomic importance. M. c
RMRDYHCP–. The mushroom book : a popular guide to the identification and study of our commoner fungi, with special emphasis on the edible varieties . Mushrooms; Mushrooms, Edible; Cookery (Mushrooms); cbk. Pouch-fungus section, to show spores in hollow rind. Section to show gills All corn smuts, wheat smuts, leaf rusts, toadstools, puff- balls, and brackets bear their spores on club-like cells, and for this reason are put in one group, called Basidiomycetes. The fact that corn smuts and leaf rusts feed on living plants, while toad- stools, brackets, and puffballs feed on dead plants, separates them in-
RMRE383J–. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 110 UKOMYCES clusters, cup-shaped, whitish-yellow, with a torn revolute margin; spores densely and minutely verruculose, yellowish, 15—21 /u- diam.. Fig. 62. U. Behenis. a, secidia on early leaf, 6, fficidia on later leaf, of S. infiata ; two teleiitospores. Teleutospores. Sori hypophyllous and on the stems, often surrounding the secondary secidia, irregularly scattered, gre- garious or circinate, rounded or oblong, covered for a considerable time by the lead-coloured epidermis, rather small and compact, browni
RMRDED3P–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fig. 214.—Cronai'tium asclepiadeum oji Ct/nanch^m Vincetoxicum. The uredo- sori sliow as spots, the teleutospore-sori as processes on the leaves, (v. Tubeuf del) also on Gentiana asclepiadea). The aecidial stage, known as Peridermium Oornui Eostr. et Kleb. produces a blister-rust on the bark of Pinus sylvestris.. Fig. 215.—Ci-onartium asclepiadeum. Section of a Cynanchum leaf. The leaf-parenchyma is permeated with m
RMRDEXEX–. Minnesota plant diseases. Plant diseases. I7J Minnesota Plant Diseases. covering below which attaches the edge of the cap to the stem. At maturity this ruptures and a part of it remains at- tached to the stem as a so-called ring. They are all earth-in- habiting saprophytes and most forms are edible while a few are poisonous. (Figs. 5, 10, 36, 81, 85, 120 to 127, 163.) Gill fungi (Agaricacece). In this group of fungi the palisade layer is spread over structures known as gills. These gills are plate- or leaf-like bodies arranged on the under side of an um- brella-like cap and run from the stal
Search Results for Fungi on leaf Black & White Stock Photos and Images (396)
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