File:Control of aphids injurious to orchard fruits, currant, gooseberry and grape (1128) (14590644639).jpg

Identifier: CAT87202928 (find matches)
Title: Control of aphids injurious to orchard fruits, currant, gooseberry and grape
Year: 1920 (1920s)
Authors: Quaintance, A. L. Baker, A. C.
Subjects: plant pests orchards Aphids Control Fruit Diseases and pests tree fruits small fruits insect pests control methods cultural control natural enemies biological control agents spraying insecticidal soaps Quassia biopesticides botanical pesticides Aphidoidea
Publisher: Washington, D.C. : U.S. Dept. of Agriculture

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pplo bud In spring Infested with young aphlds. Tho emptyegg shells aro seen still adhering to tho twig; II, young aphlds, moro enlarged; C, tho leaves nnloldingin tho bud; D, infostcd blossoms; E, a full-grown aphid of tho first generation from tho blossoms (Z>);F, a winged aphid, or spring migrant, from tho next generation on tho applo leaves; G, flight of springmigrants from applo to grain (II): IT, oats Infested by summer generations of aphlds which aro mostlywingless; /, wingless summer form; J, flight of fail migrants and males from grain back to tho applo (K);K, fall migrants and males alighting on applo leaves, tho fall migrants giving birth to tho sexual females;Z, a fall migrant; M, a malo producod on applo in fall; JV, sexual fomales showing cxtrcmo color varlotlos,and eggs which aro palo when laid, but later turn black; 0, wingless aphids that remain about tho rootsof tho grain when tho winter Is not too sovore. Farmers Bulletin 1128, U. S. DepL of Agriculture. PLATE IV.
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THE APPLC-GRAIN APHIS, Aphids Injurious to Orchard Fruits, Etc. 13 THE WOOLLY APPLE APHIS.1 Tho woolly applo aphis is often in evidence in summer on thotrunk, branches, and twigs of tho applo as bluish-White cottonypatches (fig. 8) which hido tho rusty or purplish brown aphidsbeneath. While principally injurious to tho roots of tho apple, itsinjurios abovo ground aro at times quito important. In orchardsgrown under arid or somi-arid conditions in tho West it is decidedlymoro troublosomo than in tho East, attacking tho treo wherever thobark is tender and sometimes infesting tho stems of tho loaves andfruit. Its injurios abovo ground often result in galls or swellingssimilar to thoso on tho roots, and when tho fruit spurs aro invadedtho fruiting capacity of tho tree may bo interfered with seriously.

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