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Pycnidia Stock Photos and Images
RMMCKANF–. Fig. 150. — Young ear of com inocu- lated in the silk with Diplodia. Af- ter Burrill and Barrett. bearing pycnidia.
RMT1JGY0–Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 418 UREDINEAE. Caeoma. Caeoma abietis-pectinatae Eeess. The aecidiospores may be fouiid on the lower surface of young needles of silver fir; the aecidia are yellow elongated cushions situated on either side of the needle mid-rib, and are without peridia. Pycnidia (spermogonia) are pro- duced before the aecidia. The mycelium is septate and intercellular with few
RF2NRPAHJ–Young barley plants with symptoms of fungal disease, infection on leaves, chlorosis and dark spots.
RM2AJ5NY1–Fungous diseases of plants . es-ence of the fungus, unless the berries are attacked before they arehalf grown, when they may promptly shrivel and develop thepycnidia of the fungus. The fungus also affects the leaves, andwhen found upon these parts, brown spots, irregular in outline, 26o FUNGOUS DISEASES OF PLANTS are produced within which areas the pycnidia may be found.Cuttings may also be affected. The fungus. The pycnidial stage is a characteristic Phoma orPhyllosticta, lOO to i20/x in diameter, as shown in Fig. 113.These are distributed over the affected surfaces, and produceabundant conid
RMPG3W0W–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. ASCOCHYTA. 473. U8 this fungus is injurious to Pisum sativum, Phaseolus vulgaris, Vicia sativa, etc. It causes spots on leaves and pods, followed by- drying up of the former and deformation of the latter. The pycnidia appear as tiny points on the spots, and give out bicellular cylindrical conidia. As. Boltshauseri Sacc.^ This species was first observed in Switzerland on bean {Plia- seolus vulgaris). Leaves of all ag
RMMCKA10–. Fig. 150. — Young ear of com inocu- lated in the silk with Diplodia. Af- ter Burrill and Barrett. bearing pycnidia.
RMT1HWND–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 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).
RF2NRP9BD–Young barley plants with symptoms of fungal disease, infection on leaves, chlorosis and dark spots.
RM2AJ581W–Fungous diseases of plants . antly on bean pods or stems, as seen in fig-ure . . , producing the pycnidia in a short time, and the pycnidia are then notso definite in form but formed of avery loose stromatic mass. The sub-merged hyphae are dark in color, whilethe aerial growth is dense and white,except the stromatic mass inclosingthe pycnidium. I have had culturesfor eighteen months; and althoughthey have been subjected to variousclimatic conditions, nothing of furtherinterest has as yet come from them.In nature the fungus is being closelywatched for other stages, but I cansay nothing definite
RMPG3NWM–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECT! 359 The Kieffer is practically exempt. In any case, however, the fungus may be readily controlled with Bordeaux. The spots on the leaves are few or numerous, angular, and the size varies greatly with the variety. Three fairly well differentiated zones of color are shown in an affected spot: at the center it is ashen gray, and within this area appear on either surface the minute pycnidia; the next outer zone, or area, is brown, or black in very young leaves; and sur
RMMCK5YE–. Vui. -M'. — fi. l.LMiler-shoot of Spruce, partially killed and defoliated, b, Pycnidia emerging from the rind and the leaf scars (x 5). o, Tormation of conidia inside a pycnidium ( x 240). rf, Spores germinating in water. <, Spores germinating in nutritive gelatine. (After K. Hartig.)
RMT1HE80–Diseases of glasshouse plants (1923) Diseases of glasshouse plants diseasesofglassh1923bewl Year: 1923 112 DISEASES OF GLASSHOUSE PLANTS produced on the upper surface of the leaves, varying in diameter from an eighth of an inch to patches covering haK the leaf. (Fig. 32). The tissue round the spots turns yellow, and, as the spots become old, minute dark pycnidia or fruiting bodies are distributed over the surface. Ulti- mately the leaves fall, and as the diseased plants lose their fohage they become weakened and stunted blooms are produced. On the diseased areas conidia are produced in great
RF2NRP91W–Young barley plants with symptoms of fungal disease, infection on leaves, chlorosis and dark spots.
RMAGWKNN–Camellia leaf spot Pestalotiopsis guepini mature lesion and early infection on adjacent leaf
RM2BMXA4C–Thuja needle scorch, cedar or Keithia leaf blight (Didymascella thujina) fruiting bodies on western red cedar (Thuja plicata) leaflets
RM2AKRWWF–Annual report of the North Carolina Agricultural Experiment Station . this fungus was plated from a suspension of spores two types of colonydeveloped corresponding to the two strains mentioned above. The first typeof few pycnidia developed a copious aerial mycelium of a loose floccose nature,extended regularly in all directions and was long devoid of pycnidia. Whenthe pycnidia did form they were few. large and superficial (Fig. 13). Thesecond type of many pycnidia had little or no aerial mycelium, all themycelium being either immersed or of strict growth; was roughly circular incolony, not. re
RMPG3NTP–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 363 Septoria Ribis Desm.1 is common upon various species of Ribes. With respect to the economic hosts many varieties of both currants and gooseberries are subject to attack. Large spots with pale centers and brown borders are produced (Fig. 181). These are readily distinguished from those produced by the anthracnose (cf. Fig. 79) by the large size, the well-defined outline, and the pale central dead area. The pycnidia are found in small groups at the centers of the
RMMCK7WF–. Fig. 46. Carnation Diseases. a. White tip (after Clinton), b-f. carnation rust parasite (after Blodgett, F. H.), g. stigmanose (after Woods), h. Septoria leaf spot (after Potter, M. C), i. pycnidia of Septoria dianthi, j. pow- dery mildew fungus (after Mercer, W. B.).
RMT1GWP9–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 146 DISEASES OF ECONOMIC PLANTS be of serious import, although its increase at any time under favorable climatic conditions may place it among the im- portant plant enemies. CRANBERRY * Scald, blast (Guignardia Vaccinii Shear). — The fruits are attacked as soon as the blossom falls, or even the Fig. 62. — Cranberry scald and blast. After Shear. blossom itself may be blighted. The affected berry shrivels, turns black, and is covered with pycnidia. From such fruits the disease spreads to other f
RF2NRPAD7–Young barley plants with symptoms of fungal disease, infection on leaves, chlorosis and dark spots.
RM2ANAP0H–A text-book of mycology and plant pathology . spores are small, egg-shaped orelongated, unseptate and in color pale green, or hyaline, produced inpycnidia. The most important species of this genus are Phyllostictaampelopsidis on the Virginia creeper {Ampelopsis); catalpa on catalpaleaves; labrusccB on the leaves of the grape; pavice on horse chest-nut leaves (Fig. 102); Phyllosticta solitaria E. and E. (Figs. 103 and104) is the cause of apple blotch, and vtolce on violets. The conidio- 262 MYCOL(3GY spores in Phoma are colorless and unicellular. The pycnidia areblack with a terminal pore and d
RMPG3TXF–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 476 FUNGI IMPERFECTI. of the shoots, aud either rupture the epidermis or grow out from the leaf-scar cushions (Fig. 297). The couidia are abjointed from filamentous conidiophores inside the pycnidia, and emerge as tendril-like structures. They are two-celled, small, cylindrical, and pointed at both ends. Germination takes place easily in water, and the disease spreads rapidly over the young developing shoots during
RMMCKABM–. Fig. 21. — Apple bitter rot (glomerellose) in early stage showing pycnidia. After Scott. this is sometimes the case; nor is the disease always lim- ited to ripe fruit. Its effect is seen upon both the fruit and the twig. Upon the fruit it produces a soft, wet, or in later stages corky, more or less dry, brown, tan-colored, or black, 69
RMT1HW1G–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 378 UREDINEAE. and small yellow pycnidia are produced during July or August. The aecidia follow from August till September, occupying yellow zones on the otherwise green needles; their white peridia project as much as 2 mm. above the surface of the needle, and dehisce by rupture of the apex. The aecidiospores are formed in large numbers and, carried by wind, reach leaves and shoots of alpine-rose whe
RF2NRPA5E–Young barley plants with symptoms of fungal disease, infection on leaves, chlorosis and dark spots.
RMA4BXY6–Diplodia leaf spot or leaf streak (Stenocarpella macrospora) lesion on a maize or corn leaf
RM2AKRR4C–Annual report of the North Carolina Agricultural Experiment Station . Fig. 13.— Ascochyta Chrvsanthenfi Stevens; portion of colony showing few pycnidia; cf.Fig. 14.. Fig. 14.—Ascochyta Chrysanthemi Stevens; portion of colony showing many pycnidia;cf. Fig. 13. VARIATION OF FUNGI DUE TO ENVIRONMENT. 61 of agar after the agar first plated had set, did not change the proportion ofthe two types. Nor did sowing in such way that the spores were at thebottom rather than at the top of the agar change results. There was amarked tendency of colonies of both types of the fungus to become moreproductive of
RMPG44RC–. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 262 MYCOLOGY spores in Phoma are colorless and unicellular. The pycnidia are black with a terminal pore and depressed in the tissues of the host. The genus is arbitrarily limited to those species in which the spores are less than 15/4, for the larger spored forms have been placed in the genus Macrophoma. The most important species from the pathologic viewpoint are out of the iioo species recognized the^oUowing: Phoma beta is the cause of the heart rot and blight of beets. Phoma batata p
RMMCKWK3–. Fig. 56. Egg-Plant Diseases. (7. Phomopsis of leaf, 6. Phomopsis on fruit, c. conidiophores, <f. stylospores, e. pycnospores of Phomopsis vexans, f. photomicrograph of a cross section through an infected calyx of an egg plant showing pycnidia of P. vexans (c to/, after Harter), K. anthracnose on egg-plant fruit.
RMT1HW1E–Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 378 UREDINEAE. and small yellow pycnidia are produced during July or August. The aecidia follow from August till September, occupying yellow zones on the otherwise green needles; their white peridia project as much as 2 mm. above the surface of the needle, and dehisce by rupture of the apex. The aecidiospores are formed in large numbers and, carried by wind, rea
RF2NRP9FW–Young barley plants with symptoms of fungal disease, infection on leaves, chlorosis and dark spots.
RF2RCM8P3–Glume blotch (Phaeosphaeria nodorum, Septoria glumarum) infected wheat ear. Cereals ear disease.
RM2AJ55P4–Fungous diseases of plants . i^ Fig. 187. Fly .Speck and Sooty Blotch of Apple blotch. Cell fusions and cell aggregations are commonother hand, the specks areat first dense aggregatesof rather light colored hy-phae, and from such specksdelicate hyphae may betraced to similar neighbor-ing spots or to blotches.A mature speck becomesshining black and dry.Then the central portionbreaks away and is pre-sumably the source of newinfections. No spore formhas been found accom-panying this phase. Both , ^^ r r 1 Fig. 188. Leptothyrwm Pomi: Develop- types 01 fungus have, ^ „ J ^ ° MENT OF PyCNIDIA FROM P
RMPG4B36–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. Fig. 197.—Caeonia pinitwquum. Portion of Ctteoma-patch (enlarged). /, Cortical cells partially absorbed or muck compressed ; 6, baaidia from which spores (c) are abjointed in succession: the younger with delicate walls and separated by membranous lamellae, which disappear on formation of the spore-coats (d). (After R. Hartig.) The pycnidia are produced at end of May or beginning of June, between the epidermal cell-w
RMMCKWH4–. Fig. 56. Egg-Plant Diseases. a. Phomopsis of leaf, 6. Phomopsis on fruit, c. conidiophores, rf. stylospores, e. pycnospores of Phomopsis vexans, f. photomicrograph of a cross section through an infected calyx of an egg plant showing pycnidia of P. vexans (c. to f. after Harter), g.. anthracnose on egg-plant fruit.
RMT1HJNX–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 206 DISEASES OF ECONOMIC PLANTS is destructive upon the lima bean, producing upon pods and leaves large, brown patches, with the pycnidia ar- ranged in concentric circles. When the disease is very prevalent, the pods fail to V mature their seeds. Spraying with Bordeaux mixture is recommended. Powdery mildew {Ery- siphe polygoni DC). — The characters of the powdery mildews as described for the grape apply here suffi- ciently to serve for recog- nition purposes. This dis- ease is not usually seriou
RF2RCM8P4–Glume blotch (Phaeosphaeria nodorum, Septoria glumarum) infected wheat ear. Cereals ear disease.
RM2AFXTXA–. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. Figure 2. 1. Credo sorus, with spores and mycelium. 2. Teleuto sorus and teleutospores and mycelium. (After Halsted.). Figure 3. 1,2,3. DarlHca filum: 1. Infected sorus: 2. Cross-section showing pycnidia and spores-3. Spores magnified, two showing germ lubes. 4, 5, 6. Tubercularia persicina: i Parasitein sorus of rust; 5. Spores of parasite, magnified; 6. Section through sorus, showing narasite with spores. (After Halsted.) & f a» 84 REPORT OF STATE BOARD OF HORTICULTURE. cur
RMPG4EXP–. Diseases of economic plants . Plant diseases. 146 DISEASES OF ECONOMIC PLANTS be of serious import, although its increase at any time under favorable climatic conditions may place it among the im- portant plant enemies. CRANBERRY' Scald, blast (Guignardia Vacdnii Shear). — The fruits are attacked as soon as the blossom falls, or even the. Fig. 62. — Cranberry scald and blast. After Shear. blossom itself may be blighted. The affected berry shrivels, turns black, and is covered with pycnidia. From such fruits the disease spreads to other fruits and to the leaves. In some bogs as much as 50 per
RMMCKB5P–. Fin. 21.—-Apple bitter rot (glomercHose) in early stage showing pycnidia. After Scott. this is sometimes the case; nor is the disease always lim- ited to ripe fruit. Its effect is seen upon both the fruit and the twig. Upon the fruit it produces a soft, wet, or in later stages corky, more or less dry, brown, tan-colored, or black,
RMT1HD9Y–Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Small Fruits 111 irregular, reddish brown spots with pycnidia are more rarely produced. Plants, after several years of disease, die, as do cuttings during the first or second year. Thrifty plants are much more resistant than weak ones. Particular attention should, therefore, be given to provide such irrigation as to best favor the health and vigor of the plants. Sanding the fields often gives good results, doubtless due partly to removal of con- tagion by covering infective material. It is also a
RM2ANATK6–A text-book of mycology and plant pathology . e saprophytes, useful in the destruction of dead plantparts. Many are parasites and produce dangerous diseases in culti-vated plants. A. Conidia in pycnidia, or chamber-like hollows. I. SPH/EROPSI-DALES. B. Conidia in conidial layer formed ultimately wholly free. II.MELANCONIALES. C. Conidia on conidiophores. Single or in coremia. III. HYPHO-MYCETALES. I. SPH^ROPSIDALES.—The conidia are formed in pycnidia.The receptacles are closed or open l)y a pore, or by a slit suggesting FUNGI IMiERFECTI (dEUTEROMYCETES) 261 groups of ASCOMYCETALES. Four famili
RMPG4EX4–. Diseases of economic plants . Plant diseases. SMALL FBUITS 153 although sometimes irregular in outline, generally about 3 mm. in diameter. In the center of the brown or gray discolored area very minute pycnidia may be seen in the case of septoriose; hyphse in the case of cercosporose. Defoliation, often serious to the plant, results.. Fig. 65.—Currant anthracnose. After Stewart and Eustace. The Bordeaux mixture is far superior to ammoniacal copper carbonate for these diseases. Five applications at ten- to fourteen-day intervals are needed, beginning as soon as the leaves are open. Anthracnos
![. Fig. 188. — " Cedar apple," gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpce Ell. & Mart.).— This spot is scarcely distinguishable from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of black mold. Powdery mildew, microsphaerose (Microsphcera elevata Burr). — This shows the usual powdery spots with black perithecia. Rhizoctoniose. Seep. 61. 2f Stock Photo](https://c8.alamy.com/comp/MCK9RJ/fig-188-quot-cedar-applequot-gall-of-the-rust-fungus-original-macrosporiose-macrosporium-catalpce-ell-amp-mart-this-spot-is-scarcely-distinguishable-from-phyllostictose-except-through-the-absence-of-pycnidia-and-the-presence-of-a-scant-quantity-of-black-mold-powdery-mildew-microsphaerose-microsphcera-elevata-burr-this-shows-the-usual-powdery-spots-with-black-perithecia-rhizoctoniose-seep-61-2f-MCK9RJ.jpg ". Fig. 188. — " Cedar apple," gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpce Ell. & Mart.).— This spot is scarcely distinguishable from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of black mold. Powdery mildew, microsphaerose (Microsphcera elevata Burr). — This shows the usual powdery spots with black perithecia. Rhizoctoniose. Seep. 61. 2f Stock Photo")
RMMCK9RJ–. Fig. 188. — " Cedar apple," gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpce Ell. & Mart.).— This spot is scarcely distinguishable from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of black mold. Powdery mildew, microsphaerose (Microsphcera elevata Burr). — This shows the usual powdery spots with black perithecia. Rhizoctoniose. Seep. 61. 2f
RMT1HYER–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 466 FUNGI IMPEKFECTI. stricted tissue will be found extending quite round the twig (Fig. 293). At these places the bark and cambium have been killed, whereas the higher portions of the twig have continued to increase in thickness. Numerous small black pycnidia break out on the bark of diseased places and give of!' small unicellular spindle-shaped couidia, which convey infection to new hosts in August
RM2AJ5919–Fungous diseases of plants . ithin the tissues. It penetrates the bark readily but may not ^%^ >; S-- to ^ ^^ -^ ^^^k. ^^^^bVa^^^H^^ rv* ^rA *^ ^ ^^^Hk^-3 ^ > 1 *--^^ ii^ ^^PEt^ f r / - n - -- Fig. 171. Sph.-eropsis Malorum: Mature Pycnidium. (Photographof a drawing by F. C. Stewart) extend far into the wood. The pycnidia are erumpent, usually sur-rounded by a broken epidermis (Fig. i/i) ^^^ they appear incross section somewhat depressed-conical at the apex. The sporesare oblong-elliptical, brown, and usually about twice as long asbroad, measuring in general 22-32 x 10-14/a. It has bee
RMPG4AN8–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 418 UREDINEAE. Caeoma. Caeoma abietis-pectinatae Eeess.^ The aecidiospores may be found on the lower surface of young needles of silver fir; the aecidia are yellow elongated cushions situated on either side of the needle mid-rib, and are without peridia. Pycnidia (spermogonia) are pro- duced before the aecidia. The mycelium is septate and intercellular with few haustoria. I have found the fungus fairly abundant on t
![. Fig. 188. — " Cedar apple," gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpce Ell. & Mart.).— This spot is scarcely distinguishal)le from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of black mold. Powdery mildew, microsphaerose {Microsphcera vacdnii (Schw.) Salm.). — This shows the usual powdery spots with black perithecia. Rhizoctoniose. Seep. 61. Stock Photo](https://c8.alamy.com/comp/MCKAK2/fig-188-quot-cedar-applequot-gall-of-the-rust-fungus-original-macrosporiose-macrosporium-catalpce-ell-amp-mart-this-spot-is-scarcely-distinguishalle-from-phyllostictose-except-through-the-absence-of-pycnidia-and-the-presence-of-a-scant-quantity-of-black-mold-powdery-mildew-microsphaerose-microsphcera-vacdnii-schw-salm-this-shows-the-usual-powdery-spots-with-black-perithecia-rhizoctoniose-seep-61-MCKAK2.jpg ". Fig. 188. — " Cedar apple," gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpce Ell. & Mart.).— This spot is scarcely distinguishal)le from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of black mold. Powdery mildew, microsphaerose {Microsphcera vacdnii (Schw.) Salm.). — This shows the usual powdery spots with black perithecia. Rhizoctoniose. Seep. 61. Stock Photo")
RMMCKAK2–. Fig. 188. — " Cedar apple," gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpce Ell. & Mart.).— This spot is scarcely distinguishal)le from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of black mold. Powdery mildew, microsphaerose {Microsphcera vacdnii (Schw.) Salm.). — This shows the usual powdery spots with black perithecia. Rhizoctoniose. Seep. 61.
RMT1HYK7–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 tliis fungus is injurious to Pisum sativum, Phascolus vulgaris, Vicia sativa, etc. It causes spots on leaves and pods, followed by drying up of the former and deformation of the latter. The pycnidia appear as tiny points on the spots, and give out bicellular cylindrical conidia. As. Boltshauseri Sacc. This species was first observed in Switzerland on bean {Pha- seolus vulgaris). Leaves of all ages bec
RM2AKRYK8–Annual report of the North Carolina Agricultural Experiment Station . Fig. 11.— Volutella [nidi S. andH.; two black colonies upon cba +sodium asparaginate + starch. Bessey, Ueber die Bedingungen der Farbbildung bei Fusarium, Inaug. Diss. Halle., 1904. 56 THIRTY-SECOND ANNUAL REPORT. 1SQ9. Phyllosticta sp. indet, from apple agar in Petri dishes. This fungus grew faster on agar than on cba, formed pycnidia sparsely onagar and not at all on cba. With sodium asparaginate added the mycelium becomes very dense, withconsiderable aerial development, remains colorless and produces few pycnidia.and thes
![. The fungi which cause plant disease . Plant diseases; Fungi. 242 THE FUNGI WHICH CAUSE PLANT DISEASE oculations under all conceivable conditions, failed utterly of posi- tive results. From the Caucasus Prillieux and Delacroix "^ have described a Guignardia causing a black rot of grapes which is regarded as distinct from the usual American form, differing both in the peri- thecial and conidial stages. This is called G. baccae (Cav.) Jacz. Its conidial form Phoma reniformis eventually covers the whole berry with pustules. Two kinds of pycnidia are described. G. vaccinii Sh."^- " Stock Photo](https://c8.alamy.com/comp/PG46F6/the-fungi-which-cause-plant-disease-plant-diseases-fungi-242-the-fungi-which-cause-plant-disease-oculations-under-all-conceivable-conditions-failed-utterly-of-posi-tive-results-from-the-caucasus-prillieux-and-delacroix-quot-have-described-a-guignardia-causing-a-black-rot-of-grapes-which-is-regarded-as-distinct-from-the-usual-american-form-differing-both-in-the-peri-thecial-and-conidial-stages-this-is-called-g-baccae-cav-jacz-its-conidial-form-phoma-reniformis-eventually-covers-the-whole-berry-with-pustules-two-kinds-of-pycnidia-are-described-g-vaccinii-shquot-quot-PG46F6.jpg ". The fungi which cause plant disease . Plant diseases; Fungi. 242 THE FUNGI WHICH CAUSE PLANT DISEASE oculations under all conceivable conditions, failed utterly of posi- tive results. From the Caucasus Prillieux and Delacroix "^ have described a Guignardia causing a black rot of grapes which is regarded as distinct from the usual American form, differing both in the peri- thecial and conidial stages. This is called G. baccae (Cav.) Jacz. Its conidial form Phoma reniformis eventually covers the whole berry with pustules. Two kinds of pycnidia are described. G. vaccinii Sh."^- " Stock Photo")
RMPG46F6–. The fungi which cause plant disease . Plant diseases; Fungi. 242 THE FUNGI WHICH CAUSE PLANT DISEASE oculations under all conceivable conditions, failed utterly of posi- tive results. From the Caucasus Prillieux and Delacroix "^ have described a Guignardia causing a black rot of grapes which is regarded as distinct from the usual American form, differing both in the peri- thecial and conidial stages. This is called G. baccae (Cav.) Jacz. Its conidial form Phoma reniformis eventually covers the whole berry with pustules. Two kinds of pycnidia are described. G. vaccinii Sh."^- "
RMMCK6JE–. Fig. ISl.—Uromucts Teppirianas on twigs of AlbUzia moiUana brought by Prof. Stahl from Java. (v. Tubeuf phot.) Puccinia. Teleutospores two-celled, and each abjointed from its own sporophore from large distinct sori. Each cell has as a rule only one germ-pore. Uredospores, teleutospores, and pycnidia (spermogonia) are not known in all the species. (1) Pycnidia, aecidia, uredospores, and teleutospores develop on the
RMT1HYFP–Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 466 FUNGI IMPERFECTI. stricted tissue will be found extending quite round the twig (Fig. 293), At these places the bark and cambium have been killed, whereas the higher portions of the twig have continued to increase in thickness. Numerous small black pycnidia break out on the bark of diseased places and give off small unicellular spindle-shaped conidia, which c
RF2RA57C9–Leaf spot of rye, septoria leaf blotch, speckled leaf blotch of rye. Mycosphaerella graminicola.
RM2AKRJDF–Annual report of the North Carolina Agricultural Experiment Station . Collecting the data from thelarge pycnidium type in onepolygon, and similarly with thesmall pycnidium type, we have: M= 4.1935 ±0.0247(T= 1.0902 ±0.0174 V.=25.998 ±0.443n=889 Fig. 22.—Ascochyta Chrysanthemi Stevens.gon of spores of large pycnidia. Poly- M= 5.0379 ±0.0335<r= 1.3492 ±0.0237C. V.=26.781 ±0.503n=738 It is seen that there isa tendency throughoutfor the smaller pycnidiato produce larger sporesthan areproduced by thelarge pycnidia. Fig. 23.—Ascochyta Chrysanthemi Stevens,spores of small pycnidia. THIRTY-SECOND A
![. Diseases of economic plants . Plant diseases. TREES AND TIMBER 433 gray border. The spots, from 3-6 mm. in diameter, often coalesce to form large blotches which are fragile, sometimes dropping from the leaf. Young leaves develop poorly and are deformed, while severe infection may cause complete defoliation of the tree.. Fig. 188.- ' Cedar apple." gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpw Ell. & Mart.).— This spot is scarcely distinguishable from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of Ijlack mold. Pow Stock Photo](https://c8.alamy.com/comp/PG4E8X/diseases-of-economic-plants-plant-diseases-trees-and-timber-433-gray-border-the-spots-from-3-6-mm-in-diameter-often-coalesce-to-form-large-blotches-which-are-fragile-sometimes-dropping-from-the-leaf-young-leaves-develop-poorly-and-are-deformed-while-severe-infection-may-cause-complete-defoliation-of-the-tree-fig-188-cedar-applequot-gall-of-the-rust-fungus-original-macrosporiose-macrosporium-catalpw-ell-amp-mart-this-spot-is-scarcely-distinguishable-from-phyllostictose-except-through-the-absence-of-pycnidia-and-the-presence-of-a-scant-quantity-of-ijlack-mold-pow-PG4E8X.jpg ". Diseases of economic plants . Plant diseases. TREES AND TIMBER 433 gray border. The spots, from 3-6 mm. in diameter, often coalesce to form large blotches which are fragile, sometimes dropping from the leaf. Young leaves develop poorly and are deformed, while severe infection may cause complete defoliation of the tree.. Fig. 188.- ' Cedar apple." gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpw Ell. & Mart.).— This spot is scarcely distinguishable from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of Ijlack mold. Pow Stock Photo")
RMPG4E8X–. Diseases of economic plants . Plant diseases. TREES AND TIMBER 433 gray border. The spots, from 3-6 mm. in diameter, often coalesce to form large blotches which are fragile, sometimes dropping from the leaf. Young leaves develop poorly and are deformed, while severe infection may cause complete defoliation of the tree.. Fig. 188.- ' Cedar apple." gall of the rust fungus. Original. Macrosporiose (Macrosporium Catalpw Ell. & Mart.).— This spot is scarcely distinguishable from phyllostictose except through the absence of pycnidia and the presence of a scant quantity of Ijlack mold. Pow
![. Fkj. 230.—Spores of (Jt/M. iiiacropv.it. (After Woernle.) Roestelia pirata. This is one of the commonest causes of apple-rust and of the deformation known as " cedar apples " (Fig. 240). The anatomy of the latter structures has been described by Sanford.^ G. clavipes Cooke et I'eck, occurs on Ji'niprrus coimmmis. Its aecidia and pycnidia are found on Pyrus Mains, P. arhnti- folia, and AmclancMcr canadensis. ' Sanforcl, Amialx of Botcuiy, i., 1SS7. Stock Photo](https://c8.alamy.com/comp/MCK629/fkj-230spores-of-jtm-iiiacropvit-after-woernle-roestelia-pirata-this-is-one-of-the-commonest-causes-of-apple-rust-and-of-the-deformation-known-as-quot-cedar-apples-quot-fig-240-the-anatomy-of-the-latter-structures-has-been-described-by-sanford-g-clavipes-cooke-et-ieck-occurs-on-jiniprrus-coimmmis-its-aecidia-and-pycnidia-are-found-on-pyrus-mains-p-arhnti-folia-and-amclancmcr-canadensis-sanforcl-amialx-of-botcuiy-i-1ss7-MCK629.jpg ". Fkj. 230.—Spores of (Jt/M. iiiacropv.it. (After Woernle.) Roestelia pirata. This is one of the commonest causes of apple-rust and of the deformation known as " cedar apples " (Fig. 240). The anatomy of the latter structures has been described by Sanford.^ G. clavipes Cooke et I'eck, occurs on Ji'niprrus coimmmis. Its aecidia and pycnidia are found on Pyrus Mains, P. arhnti- folia, and AmclancMcr canadensis. ' Sanforcl, Amialx of Botcuiy, i., 1SS7. Stock Photo")
RMMCK629–. Fkj. 230.—Spores of (Jt/M. iiiacropv.it. (After Woernle.) Roestelia pirata. This is one of the commonest causes of apple-rust and of the deformation known as " cedar apples " (Fig. 240). The anatomy of the latter structures has been described by Sanford.^ G. clavipes Cooke et I'eck, occurs on Ji'niprrus coimmmis. Its aecidia and pycnidia are found on Pyrus Mains, P. arhnti- folia, and AmclancMcr canadensis. ' Sanforcl, Amialx of Botcuiy, i., 1SS7.
RMT1JGRC–Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 418 UREDINEAE. Caeoma. Caeoma abietis-pectinatae Keess. The aecidiospores may be found on the lower surface of young needles of silver fir; the aecidia are yellow elongated cushions situated on either side of the needle mid-rib, and are without peridia. Pycnidia (spermogonia) are pro- duced before the aecidia. The mycelium is septate and intercellular with few haustoria. I have found the fungus fairly
RF2RA57CC–Leaf spot of rye, septoria leaf blotch, speckled leaf blotch of rye. Mycosphaerella graminicola.
RM2AFR7MG–. Quarterly journal of microscopical science. nted out in the text.7.—Spores of Mucorfusiger, Lk. x 220.8.—Fruit of Patellaria clavispora, B. and Br.; a—e, stylospores;yaud^, sporidia. x 325, except b, which is x 450.9.—Patellaria atrata, Fr.; a, ascus, with unripe sporidia; b, c, d, ripesporidia.10.—Stylospores of Patellaria atrata., Fr. 11, 12.—Vertical sections of pycnidia of Cenangiuni Cerosi. x highly.13.—Sporidia of Spharia Zobelii, Tul. 14.—Stylospores of Spharia Tiliaginea, Currey. x highly. ^ 15.—Fruit of >S^A«/7a ciliaris. Sow.; a, ascus, with sporidia; b, secondary iVuit.IT).—Sph
RF2JE8BYK–Leaf spot of rye, septoria leaf blotch, speckled leaf blotch of rye. Mycosphaerella graminicola.
RMPG45RF–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 509 confluent, marginally fimbriate, the radiating fibers arachnoid, white, distinctly branched; pycnidia tuberculariform, scattered or confluent, black; conidia oblong, constricted, 18-20 x 5. /i; conidiophores short. This fungus was first described in 1826. It is common on rose leaves. The mycelium is in part subcuticular, in part deeper. The subcuticular part is visible through the cuticle, consisting of radiate strands each composed of several parallel hyphae. From this mycelium branches pene
RMMCK654–. Fkj. ISl. —i^•o/(ii/Ct•s TcirpirimiiiK on twi^s of Albizzia moniana brought by Prof. Stahl from Java. (v. Tubeuf phot.) Puccinia. Teleutospores two-celled, and eacli abjointed from its own sporophore from large distinct sori. Each cell has as a rule only one germ-pore. Uredospores, teleutospores, and pycnidia (spermogonia) are not known in all the species. (1) Pycnidia, aecidia, arcdoHpures,and teleutospores develop on the
RMT1HE2C–Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Small Fruits 121 Upon the leaves the disease appears considerably earlier than upon the fruits. Here it produces tan-colored spots about 3-8 mm. in diameter, many or few according to the severity of the infection. In or near the centers of the older spots, upon the upper surface of the leaves, are seen the nearly microscopic pycnidia which are often arranged in concentric circles. On the young shoots the spots are somewhat more reddish and are often cracked longitudinally, but otherwise they are
RM2AKRKF9–Annual report of the North Carolina Agricultural Experiment Station . Fig. 17.—Ascochyta Chrysanthemi Ste-vens. Polygon of spores from pycnid-ium No. 2, large type. M= 4.4318 ±0.0398o-= .9589 ±0.0281C. V =21.638 ±0.650n =254 Pycnidium No. 3. From a plate bearingone large colony. The whole colony wascharacteristically one of few pycnidia whichwere of large type and light color. Thespores were obtained without any possibilityof the pycnidium being torn, that is, theywere normally ripe spores. M= 3.3848 ±0.0245o= .6714 ±0.0173C. V =19.836 ±0.531n=343 It is seen that these threeseparate pycnidia o
RF2JE8BYP–Leaf spot of rye, septoria leaf blotch, speckled leaf blotch of rye. Mycosphaerella graminicola.
RMPG401J–. Manual of fruit diseases . Fruit. 258 MANUAL OF FRUIT DISEASES trunks. When affected canes are saved for bearing wood, the fungus spreads into the arm. As a rule the mycelium does not extend into the roots. Pycnidia are developed abundantly on affected canes and on green and ripening berries (Fig. 70). They appear on the former early in the spring, and may be found on canes se'erely infected the previous year or occasionally on the current year's growth. The pycnidia mature shortly after the buds burst in the spring, and the pycnospores ooze out in long, reddish yellow coils, each contain-
RMMCK6H3–. MELAMPSORA. 367 The patches of Cacoma laricis Hartig,^ appear as golden-yellow cushions on the underside of the needles, The sporophores from which the aecidiospores are abjointed, form the centre of the patch, the periphery being occupied by numerous sterile threads, which grow out as long paraphyses; it may so happen that the whole cushion consists only of these last. The formation of Caeoma- patches is preceded by that of little pycnidia (spermogonia), which break out from under the cuticle. The mycelium lives intercellularly, and dies after the shedding of the Caeoma- spores. Melampsora
RMT1HK17–Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 208 ASCOMYCETES. will be found changing from yellow to black on account of the periderm and dead stroma becoming darker. On dead branches the large cushions of fructifications will be found to include: (a) perithecia with a warty exterior and pores set in a depression; (b) large pycnidia, standing out from the cushions, with brown smooth coats, and full of compo
RM2AKRM74–Annual report of the North Carolina Agricultural Experiment Station . Fig. 16.—Ascochyta Chrysanthemi Stevens.Polygon of spores from pycnidium No. 1, largetype. 3 should cover 20 squares instead of 25. division equal 3.7 jjl. VARIATION OF FUNGI DUE TO ENVIRONMENT. Pycnidium No. 2. Large type.. Fig. 17.—Ascochyta Chrysanthemi Ste-vens. Polygon of spores from pycnid-ium No. 2, large type. M= 4.4318 ±0.0398o-= .9589 ±0.0281C. V =21.638 ±0.650n =254 Pycnidium No. 3. From a plate bearingone large colony. The whole colony wascharacteristically one of few pycnidia whichwere of large type and light co
RF2JE8BY8–Leaf spot of rye, septoria leaf blotch, speckled leaf blotch of rye. Mycosphaerella graminicola.
RMPG14M5–. Chestnut blight. Chestnut blight; Chestnut. Endothia Canker of Chestnut SS9 They are closely crowded together, so that in cross section they appear to make up a pseudoparenchymatous tissue. These cells are more densely filled with protoplasm, and contain more pigment, than the interior cells. Pycnidia On smooth-bark, young cankers, especially in the summer, the outer cork layer is raised in numerous little blisters, with slender, yellow, waxy tendrils curling from their ruptured apices (Plate XXXVIII, Fig. i). Under each blister is a single somewhat globose pycnidiimi, surrounded by a scanty
RMMCKWM7–. Fig. 26. Sweet Potato Diseases. a. Black rot at place of a bruise, 6. black shank, c. showing a pycnidium of the black rot fungus, d. dry rot, e. cross section throug'i /, to show the effect of the disease on the root. /. Java black rot surface view, showing strings of spores oozing out from the center of spot, g. cross section through diseased sweet potato root to show pycnidia of the fungus Diplodia tubericola.
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