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Pyricola Stock Photos and Images
RF2K9841R–3D image of Amitraz skeletal formula - molecular chemical structure of non-systemic acaricide and insecticide isolated on white background
RM2D7ARA5–Yokohama, Honshu, Yokohama, Kanagawa, Japan, Hoplocampa (Hoplocampa) pyricola Rohwer, 1924, Animalia, Arthropoda, Insecta, Hymenoptera, Symphyta, Tenthredinidae
![. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Insects; Pests. The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its in Stock Photo](https://c8.alamy.com/comp/RDX96F/economic-entomology-for-the-farmer-and-the-fruit-grower-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-insects-pests-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-lilie-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psylidcs-some-species-of-which-are-exceedingly-troublesomeeg-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-in-RDX96F.jpg ". Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Insects; Pests. The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its in Stock Photo")
RMRDX96F–. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Insects; Pests. The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its in
RMW241H6–Archive image from page 196 of Danmarks fauna; illustrerede haandbøger over. Danmarks fauna; illustrerede haandbøger over den danske dyreverden.. danmarksfaunaill71dans Year: 1907 193 G H r Fig. 66. Larver af næbmunde. A tæge (Plesiocoris rugicollis); B Damtæge (Gerris najas); C cikade (Gicadula sexnotata); D blad- loppe (Psylla pyricola); E bladloppe (Trioza viridula); F mellus (Trialeurodes vaporariorum); G vingebærende bladlus (Aphis fabae); H bladlus (Periphyllus testudinatus); I skjoldlus (Goccus hesperi- dum). A-H set fra oven, I fra undersiden. (Her omtegnet fra for- skellige kilde
RMPFWRGX–. A manual for the study of insects. Insects. Fig. 196.—The Pea-rtree Psylla, greatly enlarged. Fig. 197.—Venation of Wing's: j, stigma; c, clavus; c. s., claval suture. The most destructive member of this family in the United States is the Pear-tree Psylla, Psylla pyricola (Psyl'la py-ric'o-la). This is a minute species, measuring only one- tenth inch in length to the tip of the folded wings (Fig. 196). But it occurs in such large numbers that it has destroyed extensive pear orchards, by sucking the sap from the smaller limbs and twigs. It can be destroyed by spraying the infested trees with
RM2D7AA51–Walnut Creek, Contra Costa, California, United States, Eriosoma pyricola Baker & Davidson, 1916, Animalia, Arthropoda, Insecta, Hemiptera, Sternorrhyncha, Aphididae, Eriosomatinae
![. Brehms Tierleben. Allgemeine kunde des Tierreichs. Zoology; Animal behavior. â ©(attftöfje. ^JZottenläuje. 167. Söeiöc^eu beä Sirn6tQttfto^e3, Psj-Ua pyricola Forst. ätart nergtöpert. 3la(^ aJt a r I a 11, ouä § o ro o t b, âThe Insect Book", JJeiu 2)ort 1905. burcf)fcf)nittl{cf) etlüaS fleiner, bie f^ärbung ift grüngelblicf), ber 9?ü(ien be^ SSei6rf)en§ rot. ^it ber Seben§tt)et[e beftef)t ber iuidjtigfte llnter[(f)ieb borin, ba^ bie Ãberwinterung bei biefer 9(rt im Giguftanbe ftnttfinbet. ^ie im g-rübjafjr au^o[cf}(üpfenben jungen [äugen gern a "t^m 33Iütenfn Stock Photo](https://c8.alamy.com/comp/RH63CE/brehms-tierleben-allgemeine-kunde-des-tierreichs-zoology-animal-behavior-attftfje-jzottenluje-167-seiceu-be-sirn6tqttftoe3-psj-ua-pyricola-forst-tart-nergtpert-3la-ajt-a-r-i-a-11-ou-o-ro-o-t-b-the-insect-bookquot-jjeiu-2ort-1905-burcffcfnittlcf-etlas-fleiner-bie-frbung-ift-grngelblicf-ber-9ien-be-ssei6rfen-rot-it-ber-sebenttet-e-befteft-ber-iuidjtigfte-llnter-fieb-borin-ba-bie-berwinterung-bei-biefer-9rt-im-giguftanbe-ftnttfinbet-ie-im-g-rbjafjr-auo-cfpfenben-jungen-ugen-gern-a-quottm-33itenfn-RH63CE.jpg ". Brehms Tierleben. Allgemeine kunde des Tierreichs. Zoology; Animal behavior. â ©(attftöfje. ^JZottenläuje. 167. Söeiöc^eu beä Sirn6tQttfto^e3, Psj-Ua pyricola Forst. ätart nergtöpert. 3la(^ aJt a r I a 11, ouä § o ro o t b, âThe Insect Book", JJeiu 2)ort 1905. burcf)fcf)nittl{cf) etlüaS fleiner, bie f^ärbung ift grüngelblicf), ber 9?ü(ien be^ SSei6rf)en§ rot. ^it ber Seben§tt)et[e beftef)t ber iuidjtigfte llnter[(f)ieb borin, ba^ bie Ãberwinterung bei biefer 9(rt im Giguftanbe ftnttfinbet. ^ie im g-rübjafjr au^o[cf}(üpfenben jungen [äugen gern a "t^m 33Iütenfn Stock Photo")
RMRH63CE–. Brehms Tierleben. Allgemeine kunde des Tierreichs. Zoology; Animal behavior. â ©(attftöfje. ^JZottenläuje. 167. Söeiöc^eu beä Sirn6tQttfto^e3, Psj-Ua pyricola Forst. ätart nergtöpert. 3la(^ aJt a r I a 11, ouä § o ro o t b, âThe Insect Book", JJeiu 2)ort 1905. burcf)fcf)nittl{cf) etlüaS fleiner, bie f^ärbung ift grüngelblicf), ber 9?ü(ien be^ SSei6rf)en§ rot. ^it ber Seben§tt)et[e beftef)t ber iuidjtigfte llnter[(f)ieb borin, ba^ bie Ãberwinterung bei biefer 9(rt im Giguftanbe ftnttfinbet. ^ie im g-rübjafjr au^o[cf}(üpfenben jungen [äugen gern a "t^m 33Iütenfn
RM2ARC5TH–Pear sucker (Cacopsylla pyricola) fruit tree crop pest nymph on a pear (Pyrus communis) leaf
RMPG3NW4–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 360 FUNGOUS DISEASES OF PLANTS. Fig. 178. Septoria Pyricola : Section of Pycnidium nutrient media, germ tubes being pushed out from either end or from the middle (Fig. 179). This fungus has been readily cultivated upon bean stems and pear twigs, and I have reported the growth as follows: Here the fungus grew slowly at first, producing after sev- eral weeks the pyc- nidia of the Septoria. After several trans- fers this fungus grows quite luxuriantly on bean pods or stems, as seen in
RM2FWR7J7–Photomicrograph of overwintering pear sucker (Cacopsylla pyricola) eggs laid on a pear twig
RMT1H4EJ–Distribution maps of some insect Distribution maps of some insect pests in the United States distributionmaps00unit Year: 1959 Psylla pyricola (pear psylla)
RMMCK3T6–. Abb. 1. a) Psylla pyricola, Dorsalansicht. — Nach Haupt, b) Psylla mali, Latoral- ansicht. A, a := Analis; Ax =^ Axillaris; C = Costa; Cu, cu = Cubitus; M, m = Me- dia; i? = Radius; Rr,rr= Radialramus. — Nach Speyer.
RM2AWY246–Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . The pear-psylla—a, pupa from under side, showing the thread-like piercing lancets;to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species ofwhich are exceedingly troublesome,—^.^., the pear-psylla,Psylla pyricola. This infests pear-trees in the more northernparts of the country, extending south to Maryland, thoughsouth of New York State it occurs in isolated patches only. Itdoes its injury, first, by sucking the juices of th
RMPG3NTT–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 178. Septoria Pyricola : Section of Pycnidium nutrient media, germ tubes being pushed out from either end or from the middle (Fig. 179). This fungus has been readily cultivated upon bean stems and pear twigs, and I have reported the growth as follows: Here the fungus grew slowly at first, producing after sev- eral weeks the pyc- nidia of the Septoria. After several trans- fers this fungus grows quite luxuriantly on bean pods or stems, as seen in fig- ure . . , producing the py
RM2FWR7DN–Photomicrograph of overwintering pear sucker (Cacopsylla pyricola) eggs laid on a pear twig
RMT1H4EH–Distribution maps of some insect Distribution maps of some insect pests in the United States distributionmaps00unit Year: 1959 - 22 - FRUIT INSECTS Panonychus ulmi (European red mite) Psylla pyricola (pear psylla)
![. Economic entomology for the farmer and fruit-grower . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening it; second, it exude Stock Photo](https://c8.alamy.com/comp/MAA9FT/economic-entomology-for-the-farmer-and-fruit-grower-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesome-g-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-injury-first-by-sucking-the-juices-of-the-plant-and-so-weakening-it-second-it-exude-MAA9FT.jpg ". Economic entomology for the farmer and fruit-grower . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening it; second, it exude Stock Photo")
RMMAA9FT–. Economic entomology for the farmer and fruit-grower . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening it; second, it exude
RM2AJ6XRB–Journal of bacteriology . arious species of flies are thought not to be active agents in transmit-ing infection though they may be important in carrying the organismto blossoms or to wounds. The experiments included the followingsuspected carriers: Pollenia rudis, Empoasca mali, Psylla pyricola,Plagiognathus politus, Sapromyza hispina.—F. L. S. Citrus Canker. F. A. Wolf. (J. Agr. Res. 6, 69-99.) A serious citrus disease has recently been introduced into the GulfStates, known as citrus canker. The primary cause is Ps. citri Hasse,an organism with a single flagellum, shown by the writer to have
RMPFWRH3–. A manual for the study of insects. Insects. Fig. 196.—The Pea-rtree Psylla, greatly enlarged. Fig. 197.—Venation of Wing's: j, stigma; c, clavus; c. s., claval suture. The most destructive member of this family in the United States is the Pear-tree Psylla, Psylla pyricola (Psyl'la py-ric'o-la). This is a minute species, measuring only one- tenth inch in length to the tip of the folded wings (Fig. 196). But it occurs in such large numbers that it has destroyed extensive pear orchards, by sucking the sap from the smaller limbs and twigs. It can be destroyed by spraying the infested trees with
RMRYR4KC–Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the 'pear-psylla,' Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occu
![. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by Stock Photo](https://c8.alamy.com/comp/MAAC69/economic-entomology-for-the-farmer-and-the-fruit-grower-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesomeeg-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-injury-first-by-MAAC69.jpg ". Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by Stock Photo")
RMMAAC69–. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by
RM2AJ586Y–Fungous diseases of plants . Fig. 177. Dilution Culture of Septoria Pyricola which is purplish in color (Fig. 176). These color details are lostin very old leaves, but the black papillae indicating the pycnidiathen show up clearly. At maturity the spores may ooze out in darkuniform cirras. In cross section the pycnidium is clearly ovate inform. The wall is made up of several layers of dark cells, and thehyaline conidiophores arise from an inconspicuous inner layer(Fig. 178). The spores are flexuous and quite constantly two-septate, measuring about 60 X 3-4 /i. The mycelium is intercel-lular, b
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
RMRX8550–Economic entomology for the farmer Economic entomology for the farmer and fruit-grower economicentomolo01smit Year: 1906 The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the 'pear-psylla,' Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the j
![. Economic entomology for the farmer.. . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family PsyllidcB, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening it; second, it exudes honey-dew in Stock Photo](https://c8.alamy.com/comp/MAAA5E/economic-entomology-for-the-farmer-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidcb-some-species-of-which-are-exceedingly-troublesomeeg-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-injury-first-by-sucking-the-juices-of-the-plant-and-so-weakening-it-second-it-exudes-honey-dew-in-MAAA5E.jpg ". Economic entomology for the farmer.. . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family PsyllidcB, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening it; second, it exudes honey-dew in Stock Photo")
RMMAAA5E–. Economic entomology for the farmer.. . The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family PsyllidcB, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening it; second, it exudes honey-dew in
RM2AJ58KR–Fungous diseases of plants . Fig. 175. Leaf Blotch of Rose 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. 1^7-16^. 1898. The leaf spot of pear is a disease whicli may be readily dis-tinguished from the leaf blight subsequently described. It occursthroughout the eastern United States as an important fungus, both. Fig. 176. Leaf Siot of Pear in orchards and nurseries. It is probably found throughout NorthAmerica and is reported from various parts of Europe.
RMPFHCY2–. Danmarks fauna; illustrerede haandbøger over den danske dyreverden... 193. G H r Fig. 66. Larver af næbmunde. A tæge (Plesiocoris rugicollis); B Damtæge (Gerris najas); C cikade (Gicadula sexnotata); D blad- loppe (Psylla pyricola); E bladloppe (Trioza viridula); F mellus (Trialeurodes vaporariorum); G vingebærende bladlus (Aphis fabae); H bladlus (Periphyllus testudinatus); I skjoldlus (Goccus hesperi- dum). A-H set fra oven, I fra undersiden. (Her omtegnet fra for- skellige kilder). mødes snabelskedens rande, der fortil dækkes af over- læben, på organets ventralt vendende side; hos mange h
RMRX854T–Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the 'pear-psylla,' Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs
![. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by Stock Photo](https://c8.alamy.com/comp/MAAAW3/economic-entomology-for-the-farmer-and-the-fruit-grower-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-lilie-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psylidcs-some-species-of-which-are-exceedingly-troublesomeeg-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-injury-first-by-MAAAW3.jpg ". Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by Stock Photo")
RMMAAAW3–. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The pear-psylla—a, pupa from under side, showing the thread-lilie piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psy/lidcs, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by
RM2ANAK90–A text-book of mycology and plant pathology . Fig. 105.—Septoria leaf spot disease of celery, or celery blight. {After Coons, G. N.and Levin, Ezra, Spec. Bull. 77, Mich. Agric. Coll. Exper. Stat., March. 1916. SPORES,. Fig. 106.—Section through leaf spot of celery blight (Septoria) showing hyphae)in leaf tissue and pycnidium with exuding pycnospores. (After Coons, G. H., andLevin, Ezra, Spec. Bull. 77, Mich. Agric. Coll. Exper. Stat., March, 1916.) 264 MYCOLOGY eludes the fungi which cause the leaf spot of the pear, Septoria pyricola,the late blight of the celery S. petroselini (Figs. 105 and
![Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the ' pear-psylla,' 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York S Stock Photo](https://c8.alamy.com/comp/RYR49B/economic-entomology-for-the-farmer-economic-entomology-for-the-farmer-and-fruit-grower-microform-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-economicentomolo00insmit-year-1896-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesomeeg-the-pear-psylla-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-s-RYR49B.jpg "Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the ' pear-psylla,' 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York S Stock Photo")
RMRYR49B–Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the ' pear-psylla,' 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York S
![. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the " pear-psylla," 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, Stock Photo](https://c8.alamy.com/comp/MAABG5/economic-entomology-for-the-farmer-and-fruit-grower-microform-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesomeeg-the-quot-pear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-injury-MAABG5.jpg ". Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the " pear-psylla," 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, Stock Photo")
RMMAABG5–. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the " pear-psylla," 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury,
RMRCCBXG–. Dr. H. G. Bronn's Klassen und Ordnungen des Thier-Reichs : wissenschaftlich dargestellt in Wort und Bild. Zoology; Mollusks; Arthropoda; Insects. VIII. b. y. 12 Psyllina Die Dauer (in Tagen) der einzelnen Larvenstadien von P. m.ali (nach AwATi, England) und einiger anderer Arten kann aus folgender Tabelle ent- nommen werden: iSpeeies II S t a d i u m III I IV C4esamt- dauer Autor Psylla mali P. pyricola P. melanoneiiid P. amhigua Trioza nigricorn is 7-8i 8 7-8 y 7 7 12 8 9 7-8^ 5 4 10-15 I 13-14 7 I 9 8 : 12 5 ' 10 5 11 45-53 39 42 44 32-33 AwATI Lal Lal Lal Heinze u. Profft Die Larvenstadie
RMMCK3RW–. Abb. 2. Eier von Psyllinen. a) Psylla mali, nach Speyer, b) Psylla pyricola, nach LuNDBLAD, c) Tfioza nigriconiis, nach Lundblad, (/) Trioza viridula. nach Rostbup, e) Phytolyma lata, nach Vosseler. Psylla nmli (xA bb. 8) reicht der dornförmige Fortsatz durch das Korkkambium hindurch. Bei vielen Arten besitzt auch der vordere Eipol eigenartige Anhänge (Abb. 2, a, h, e). Besonders merkwürdig ist dieser Fortsatz bei Phytolyma (Abb. 2e), wo er sich wie der Henkel eines Körbchens bis zum Hinterende umbiegt, um dann wieder mit einem schnabelförmigen Ende nach vorn zu ziehen. Die EigröÃe ist
RM2CE2GE2–. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California . FIG. 50. Pear-treePsylla) Psy lla -pyri-cola). Enlarged. FIG. 51. Larva ofPsylla pyricola.Enlarged. 84 REPORT OF THE COMMISSIONER OF HORTICULTURE.
RM2CE2F4D–. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California . FIG. 50. Pear-treePsylla) Psy lla -pyri-cola). Enlarged. FIG. 51. Larva ofPsylla pyricola.Enlarged. 84 REPORT OF THE COMMISSIONER OF HORTICULTURE.. FIG. 52. Aphid? or plant lice. Winged and wing-less forms. 1 and 3 natural size. 2 and 4 greatlyenlarged. many species, some of which attack most forms of vegetation. In thisfamily we have the phylloxera and the woolly-aphis, and many otherwell-known forms, all exceedingly destructive to vegetation. The larg-est species is about
RM2CDCBNN–. Fungous diseases of plants, with chapters on physiology, culture methods and technique . olor are shown in an affected spot: at the center it isashen gray, and within this area appear on either surface the minutepycnidia; the next outer zone, or area, is brown, or black in veryyoung leaves; and surrounding this second there may be an area ^^- J5/-* ^ , -.^. Fig. 177. Dilution Culture of Septoria Pyricola which is purplish in color (Fig. 176). These color details are lostin very old leaves, but the black papillae indicating the pycnidiathen show up clearly. At maturity the spores may ooze 9
RM2CDCBNE–. Fungous diseases of plants, with chapters on physiology, culture methods and technique . Fig. 175. Leaf Blotch of Rose 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. 1^7-16^. 1898. The leaf spot of pear is a disease which may be readily dis-tinguished from the leaf blight subsequently described. It occursthroughout the eastern United States as an important fungus, both. Fig. 176. Leaf Spot of Pear in orchards and nurseries. It is probably found throughou
RMRGWPK3–. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 1.—The European Fruit Lecanium (Lecanium corni Bouche) on Pecan. (Original.). Fig. 2.—The European Pear Scale (Epidiaspis pyricola Del Guer. ^ on Pear. (Original.). 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.. United States. Bureau of Entomology. Washington : G. P. O.
RMRGWNC6–. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 1.—The European Fruit Lecanium iLecanium corni Bouche) on Pecan. (Original.). Fig. 2.—The European Pear Scale iEpidiaspis pyricola Del Guer.i on Pear. (Original.). 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.. United States. Bureau of Entomology. Washington : G. P. O.
RMRH0YBG–. Bulletin. Agriculture -- Ontario. 19 The Pear=Tree Psylla (Psylla pyricola), Figs. 30, 31. Many com- plaints have been made of late years respecting- injuries to Pear-trees by this minute insect. It belongs to the same order as the plant-lice and scale insects which are so prolific and destructive. The winter is passed in crevices of the bark, or in rubbish or other shelter, by the mature winged fly, which is brick-red in color and about an eighth of an inch in length. About the middle of April the fly comes out of its hiding place and lays its yellow eggs on buds and twigs wherever there is
RMRMAJRP–. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. 30 THE REPOET OF TPIE - No. 36 quite small and causing from one to ten ugly scars on each fruit where they punc- tured it when feeding. So far as we could see all the damage was done by the nymphs. We hope to do some work on this subject next year, as it is one of great interest and no small economic importance. Peae Psylla (Psylla pyricola). We planned out and applied a series of ex- periments this spring to test the value of lime-sulphur in the control of this tiny but very destructive insect. To
![. Economic entomology for the farmer and fruit-grower. Beneficial insects. The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening i Stock Photo](https://c8.alamy.com/comp/RDTK5R/economic-entomology-for-the-farmer-and-fruit-grower-beneficial-insects-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesome-g-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-injury-first-by-sucking-the-juices-of-the-plant-and-so-weakening-i-RDTK5R.jpg ". Economic entomology for the farmer and fruit-grower. Beneficial insects. The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening i Stock Photo")
RMRDTK5R–. Economic entomology for the farmer and fruit-grower. Beneficial insects. The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—^-g-, the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its injury, first, by sucking the juices of the plant and so weakening i
![. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the " pear-psylla," 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. Stock Photo](https://c8.alamy.com/comp/RDXHT0/economic-entomology-for-the-farmer-and-fruit-grower-microform-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-beneficial-insects-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesomeeg-the-quot-pear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-RDXHT0.jpg ". Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the " pear-psylla," 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. Stock Photo")
RMRDXHT0–. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. The pear-psylla,—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the " pear-psylla," 'Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only.
![. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Entomology; Pests. The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its Stock Photo](https://c8.alamy.com/comp/RDYB47/economic-entomology-for-the-farmer-and-the-fruit-grower-and-for-use-as-a-text-book-in-agricultural-schools-and-colleges-entomology-pests-the-pear-psyllaa-pupa-from-under-side-showing-the-thread-like-piercing-lancets-to-the-right-a-winged-adult-and-stalked-egg-cicada-they-all-belong-to-the-family-psyllidce-some-species-of-which-are-exceedingly-troublesomeeg-the-quotpear-psyllaquot-psylla-pyricola-this-infests-pear-trees-in-the-more-northern-parts-of-the-country-extending-south-to-maryland-though-south-of-new-york-state-it-occurs-in-isolated-patches-only-it-does-its-RDYB47.jpg ". Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Entomology; Pests. The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its Stock Photo")
RMRDYB47–. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Entomology; Pests. The pear-psylla.—a, pupa from under side, showing the thread-like piercing lancets; to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species of which are exceedingly troublesome,—e.g., the "pear-psylla," Psylla pyricola. This infests pear-trees in the more northern parts of the country, extending south to Maryland, though south of New York State it occurs in isolated patches only. It does its
![. Common insects affecting fruit-trees [microform]. Insect pests; Fruits; Insectes nuisibles; Fruit. S8. Fig. 36. Nectria Canker. INSECTS AFFECTING THE PEAR. Most, if not all, of the insects that attack the Apple are equally in- jurious to the Pear, but there are a few additional kinds to which atten- tion must be drawn. The Pe.r-Tree Psyi.i.a {^Psylla pyricola). Figs. 37, 38. Many com- plaints have been made of late years respecting injuries to Pear-trees by this minute insect. It belongs to the same order as the plant-lice and scale insects which are so prolific and destructive. The winter Stock Photo](https://c8.alamy.com/comp/REN4DB/common-insects-affecting-fruit-trees-microform-insect-pests-fruits-insectes-nuisibles-fruit-s8-fig-36-nectria-canker-insects-affecting-the-pear-most-if-not-all-of-the-insects-that-attack-the-apple-are-equally-in-jurious-to-the-pear-but-there-are-a-few-additional-kinds-to-which-atten-tion-must-be-drawn-the-per-tree-psyiia-psylla-pyricola-figs-37-38-many-com-plaints-have-been-made-of-late-years-respecting-injuries-to-pear-trees-by-this-minute-insect-it-belongs-to-the-same-order-as-the-plant-lice-and-scale-insects-which-are-so-prolific-and-destructive-the-winter-REN4DB.jpg ". Common insects affecting fruit-trees [microform]. Insect pests; Fruits; Insectes nuisibles; Fruit. S8. Fig. 36. Nectria Canker. INSECTS AFFECTING THE PEAR. Most, if not all, of the insects that attack the Apple are equally in- jurious to the Pear, but there are a few additional kinds to which atten- tion must be drawn. The Pe.r-Tree Psyi.i.a {^Psylla pyricola). Figs. 37, 38. Many com- plaints have been made of late years respecting injuries to Pear-trees by this minute insect. It belongs to the same order as the plant-lice and scale insects which are so prolific and destructive. The winter Stock Photo")
RMREN4DB–. Common insects affecting fruit-trees [microform]. Insect pests; Fruits; Insectes nuisibles; Fruit. S8. Fig. 36. Nectria Canker. INSECTS AFFECTING THE PEAR. Most, if not all, of the insects that attack the Apple are equally in- jurious to the Pear, but there are a few additional kinds to which atten- tion must be drawn. The Pe.r-Tree Psyi.i.a {^Psylla pyricola). Figs. 37, 38. Many com- plaints have been made of late years respecting injuries to Pear-trees by this minute insect. It belongs to the same order as the plant-lice and scale insects which are so prolific and destructive. The winter
RMREERFK–. Comparative morphology of Fungi. Fungi. 268 COMPARATIVE MORPHOLOGY OF FUNGI To Septorisphaerella belong Mycosphaerella Hippocastani (Carlia Hippocastani), a leaf spot of Aesculus Hippocastanum, and M. sentina, a leaf spot of pear. As imperfect forms besides pycnia with multicellular conidia (Septoria aesculicola), Klebahn (1918) found in culture free falcate conidia similar to Septoria conidia which are cut off laterally on hyphae and also pycnia with very small bacilliform microconidia.. Fig. 178.—Mycosphaerella sentina. 1. Pycnial stage. Septoria pyricola. 2. Part of perithecial wall. 3. P
RMRE95Y7–. Cooperative economic insect report. Beneficial insects; Insect pests. - 193 - PEAR PSYLLA (Psylla pyricola) increased rapidly during May and June in central WASHINGTON, encouraged by early season control failures and favorable weather. The pest was greatly reduced in the Yakima area of Yakima County by high temper- atures in July and control chemicals. Resistance, which appeared in 1961 to the latest phosphate control material, became a serious problem in 1962. Populations of pear psylla were low throughout the season in western Washington. Control of the psylla in Jackson County, OREGON, wa
RMRDJ64K–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 360 FUNGOUS DISEASES OF PLANTS. Fig. 178. Septoria Pyricola : Section of Pycnidium nutrient media, germ tubes being pushed out from either end or from the middle (Fig. 179). This fungus has been readily cultivated upon bean stems and pear twigs, and I have reported the growth as follows: Here the fungus grew slowly at first, producing after sev- eral weeks the pyc- nidia of the Septoria. After several trans- fers this fungus grows quite luxuriantly on bean pods or stems, as seen in
RMRDJ648–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 178. Septoria Pyricola : Section of Pycnidium nutrient media, germ tubes being pushed out from either end or from the middle (Fig. 179). This fungus has been readily cultivated upon bean stems and pear twigs, and I have reported the growth as follows: Here the fungus grew slowly at first, producing after sev- eral weeks the pyc- nidia of the Septoria. After several trans- fers this fungus grows quite luxuriantly on bean pods or stems, as seen in fig- ure . . , producing the py
RMRD7DKC–. A manual for the study of insects. Insects. Fig. 196.—The Pea-rtree Psylla, greatly enlarged. Fig. 197.—Venation of Wing's: j, stigma; c, clavus; c. s., claval suture. The most destructive member of this family in the United States is the Pear-tree Psylla, Psylla pyricola (Psyl'la py-ric'o-la). This is a minute species, measuring only one- tenth inch in length to the tip of the folded wings (Fig. 196). But it occurs in such large numbers that it has destroyed extensive pear orchards, by sucking the sap from the smaller limbs and twigs. It can be destroyed by spraying the infested trees with
RMRD7DKA–. A manual for the study of insects. Insects. Fig. 196.—The Pea-rtree Psylla, greatly enlarged. Fig. 197.—Venation of Wing's: j, stigma; c, clavus; c. s., claval suture. The most destructive member of this family in the United States is the Pear-tree Psylla, Psylla pyricola (Psyl'la py-ric'o-la). This is a minute species, measuring only one- tenth inch in length to the tip of the folded wings (Fig. 196). But it occurs in such large numbers that it has destroyed extensive pear orchards, by sucking the sap from the smaller limbs and twigs. It can be destroyed by spraying the infested trees with
RMRDJ65K–. 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
![. Annual report, including a report of the insects of New Jersey, 1909. Fig. 41.—Pear psylla; pupa from above; much enlarged.. Fig. 42.-—Pear psylla; pupa from below; much enlarged. P. annulata Fitch. Sure to occur in New Jersey. P. carpina Fitch. Common on Carpinus in New York, and probably in New Jersey. P. buxi Linn. An imported species on "Buxus sempervirens," which has been found in Jersey City. P. pyricola Forst. Throughout the State but more abundant in the south- ern counties. This is the "pear psylla," and its injuries are very local though sometimes severe. PACHYP Stock Photo](https://c8.alamy.com/comp/RM7WF8/annual-report-including-a-report-of-the-insects-of-new-jersey-1909-fig-41pear-psylla-pupa-from-above-much-enlarged-fig-42-pear-psylla-pupa-from-below-much-enlarged-p-annulata-fitch-sure-to-occur-in-new-jersey-p-carpina-fitch-common-on-carpinus-in-new-york-and-probably-in-new-jersey-p-buxi-linn-an-imported-species-on-quotbuxus-sempervirensquot-which-has-been-found-in-jersey-city-p-pyricola-forst-throughout-the-state-but-more-abundant-in-the-south-ern-counties-this-is-the-quotpear-psyllaquot-and-its-injuries-are-very-local-though-sometimes-severe-pachyp-RM7WF8.jpg ". Annual report, including a report of the insects of New Jersey, 1909. Fig. 41.—Pear psylla; pupa from above; much enlarged.. Fig. 42.-—Pear psylla; pupa from below; much enlarged. P. annulata Fitch. Sure to occur in New Jersey. P. carpina Fitch. Common on Carpinus in New York, and probably in New Jersey. P. buxi Linn. An imported species on "Buxus sempervirens," which has been found in Jersey City. P. pyricola Forst. Throughout the State but more abundant in the south- ern counties. This is the "pear psylla," and its injuries are very local though sometimes severe. PACHYP Stock Photo")
RMRM7WF8–. Annual report, including a report of the insects of New Jersey, 1909. Fig. 41.—Pear psylla; pupa from above; much enlarged.. Fig. 42.-—Pear psylla; pupa from below; much enlarged. P. annulata Fitch. Sure to occur in New Jersey. P. carpina Fitch. Common on Carpinus in New York, and probably in New Jersey. P. buxi Linn. An imported species on "Buxus sempervirens," which has been found in Jersey City. P. pyricola Forst. Throughout the State but more abundant in the south- ern counties. This is the "pear psylla," and its injuries are very local though sometimes severe. PACHYP
RMRGK932–. Bulletin of the British Museum (Natural History) Entom Supp. 274 M. W. R. de V. GRAHAM. 216 Figs. 209-220. Gastrancistrus spp. 209, dispar sp. n., <$, antenna ; 210, fuscicornis Walker, $, antenna ; 211, same, q*. antenna ; 212, same, ?, fore wing ; 213, alectus Walker, $, fore wing venation ; 214, pyricola (Marchal), $, clypeus and genae ; 215, cupreus sp. n., $, clypeus and genae ; 216, unicolor Walker, $, clypeus ; 217, coxalis (Thomson), $, fore wing venation ; 218, pyricola (Marchal), $, fore wing venation ; 219, cupreus sp. n., 9. fore wing venation ; 220, unicolor Walker, $, fore w
![. Distribution maps of some insect pests in the United States. Insect pests United States; Insect pests Maps. Psylla pyricola (pear psylla). 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.. United States. Plant Pest Control Division. [Washington, Plant Pest Control Division, Agricultural Research Service] Stock Photo](https://c8.alamy.com/comp/RCCY1A/distribution-maps-of-some-insect-pests-in-the-united-states-insect-pests-united-states-insect-pests-maps-psylla-pyricola-pear-psylla-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-united-states-plant-pest-control-division-washington-plant-pest-control-division-agricultural-research-service-RCCY1A.jpg ". Distribution maps of some insect pests in the United States. Insect pests United States; Insect pests Maps. Psylla pyricola (pear psylla). 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.. United States. Plant Pest Control Division. [Washington, Plant Pest Control Division, Agricultural Research Service] Stock Photo")
RMRCCY1A–. Distribution maps of some insect pests in the United States. Insect pests United States; Insect pests Maps. Psylla pyricola (pear psylla). 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.. United States. Plant Pest Control Division. [Washington, Plant Pest Control Division, Agricultural Research Service]
![. Distribution maps of some insect pests in the United States. Insect pests United States; Insect pests Maps. - 22 - FRUIT INSECTS Panonychus ulmi (European red mite). Psylla pyricola (pear psylla). 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.. United States. Plant Pest Control Division. [Washington, Plant Pest Control Division, Agricultural Research Service] Stock Photo](https://c8.alamy.com/comp/RCCY1B/distribution-maps-of-some-insect-pests-in-the-united-states-insect-pests-united-states-insect-pests-maps-22-fruit-insects-panonychus-ulmi-european-red-mite-psylla-pyricola-pear-psylla-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-united-states-plant-pest-control-division-washington-plant-pest-control-division-agricultural-research-service-RCCY1B.jpg ". Distribution maps of some insect pests in the United States. Insect pests United States; Insect pests Maps. - 22 - FRUIT INSECTS Panonychus ulmi (European red mite). Psylla pyricola (pear psylla). 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.. United States. Plant Pest Control Division. [Washington, Plant Pest Control Division, Agricultural Research Service] Stock Photo")
RMRCCY1B–. Distribution maps of some insect pests in the United States. Insect pests United States; Insect pests Maps. - 22 - FRUIT INSECTS Panonychus ulmi (European red mite). Psylla pyricola (pear psylla). 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.. United States. Plant Pest Control Division. [Washington, Plant Pest Control Division, Agricultural Research Service]
RMRD018F–. Elementary entomology. Entomology. THK TRUE BUGS 127 The psyllas, or jumping plant-lice {Psyllidae), look much like miniature cicadas, but are more nearly related to the true plant-lice, exuding sweet honey-dew like the plant-lice but differing from them in being very agile in the adult stage, giving a quick jump with their strong hind legs and flying off at the slightest disturbance, whereas the true plant-lice are exceedingly sluggish. The best-known example is the pear psylla {Psylla pyricola), the adult of which (Fig. 174, a) is not over a tenth of an inch long but which occurs in such e
RMRCCBRP–. Dr. H. G. Bronn's Klassen und Ordnungen des Thier-Reichs : wissenschaftlich dargestellt in Wort und Bild. Zoology; Mollusks; Arthropoda; Insects. X. System VIII. b. '/. 77 Mitrapsylla Crawf. Psylla GeofE. mit über 130 Arten. P. mali Schmidb. schädlich auf Apfelbäumen. P. alni L. auf Erlen. P. buxi L. P. crataegi Schrk. P. melanoneura Forst. P. fyri L. P. pyricola Forst. Gefleckter Birnblattsauger. P. pyrisuga Forst. Birnblattsauger. Floria Low. Alloeoneura Low. Sfanioneura Low. 5. Unterfamilie Ceriacreininae End. Ceiiacreminae End. 1910, Crawf. 1914. Ceriacremum End. Prionocnemidae Scott 188
RMRD1PGJ–. Danmarks fauna; illustrerede haandbøger over den danske dyreverden... 193. G H r Fig. 66. Larver af næbmunde. A tæge (Plesiocoris rugicollis); B Damtæge (Gerris najas); C cikade (Gicadula sexnotata); D blad- loppe (Psylla pyricola); E bladloppe (Trioza viridula); F mellus (Trialeurodes vaporariorum); G vingebærende bladlus (Aphis fabae); H bladlus (Periphyllus testudinatus); I skjoldlus (Goccus hesperi- dum). A-H set fra oven, I fra undersiden. (Her omtegnet fra for- skellige kilder). mødes snabelskedens rande, der fortil dækkes af over- læben, på organets ventralt vendende side; hos mange h
RMRCMGXT–. Die Gartenwelt. Gardening. XVI, 49 Die Gartenwelt. 679 seife in 1500 1 Wasser. Gegen die Larven wird von Mitte April bis Anfang Mai, gegen die erwachsenen Tiere im Spät- herbst gespritzt. Die anderen auf dem Apfelbaum anzutreffenden Psylla- arten sind: simulans Fstr., pyrastri Lw. und pyricola Fstr. Die Lebensweise von Ps. simulans Fstr. ist zur Zeit noch unbekannt. Low hat die Imagines im Sommer auf Aepfel- und Birnbäumen gefunden und nimmt an, daß sie dort auch ihre Verwandlung durchmachen. Ps. pyricola Fstr. wurde bereits beim Birnbaum ausführlicher erwähnt. Die Lebens- geschichte von Ps.
![. Cooperative economic insect report. Beneficial insects; Insect pests. PEAR PSYLLA (Psylla pyricola) PEAR LEAF BLISTER MITE (Eriophyes pyri). 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.. United States. Animal and Plant Health Service. Plant Protection and Quarantine Programs; United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Division. Hyattsville, MD. [etc. ] Plant Protection an Stock Photo](https://c8.alamy.com/comp/RE95MM/cooperative-economic-insect-report-beneficial-insects-insect-pests-pear-psylla-psylla-pyricola-pear-leaf-blister-mite-eriophyes-pyri-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-united-states-animal-and-plant-health-service-plant-protection-and-quarantine-programs-united-states-bureau-of-entomology-and-plant-quarantine-united-states-plant-pest-control-division-hyattsville-md-etc-plant-protection-an-RE95MM.jpg ". Cooperative economic insect report. Beneficial insects; Insect pests. PEAR PSYLLA (Psylla pyricola) PEAR LEAF BLISTER MITE (Eriophyes pyri). 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.. United States. Animal and Plant Health Service. Plant Protection and Quarantine Programs; United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Division. Hyattsville, MD. [etc. ] Plant Protection an Stock Photo")
RMRE95MM–. Cooperative economic insect report. Beneficial insects; Insect pests. PEAR PSYLLA (Psylla pyricola) PEAR LEAF BLISTER MITE (Eriophyes pyri). 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.. United States. Animal and Plant Health Service. Plant Protection and Quarantine Programs; United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Division. Hyattsville, MD. [etc. ] Plant Protection an
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