‘ 
CONTROL OF APHIDS INJURIOUS TO ORCHARD 
FRUITS, CURRANT, GOOSEBERRY, AND GRAPE.’ 
A. L. QuatntTance, Entomologist in Charge, and A. C. BAKER, Entomologist, 
Deciduous Fruit Insect Investigations. 
CONTENTS. 
Page. Page. 
PAphidsinPenera ls. sceuk ene sot eaeacs. sols 5 4c || Controlmegsunesan saeco aess see See oe 38 
JN(SJOUTE YO CUs Oe Se” ee ai a ee 5 insecticides eer easas-o oc cea atace a oe 39 
ONSTAGE 0) 0G RS aay 5k Sl ee 2 14 Spraying for apple aphids. .............. 45 
Pear aphids attacking the foliage-........_.. 15 The delayed dormant treatment......... 45 
TEL Fagek sto} site beet eee oS a oe 15 Control of aphids on plum, peach, cherry, 
IBHEEE YA DOTS: ase eres. Pee ee is las 20 21 Caen A EE pee tee be om EE 47 
Meee DANS soo eeccMo cre) No deeen ote ccs c 25 Control of aphids on currant, gooseberry, 
Currant and gooseberry aphids. ...........-- 28 ae Wea 0): ene ee ee See nS 48 
Grape aphids attacking the foliage........... 36 Gleamculture ssssc sock a. came eee aee 48 
Natural enemies of aphids................... 37 
HE control of aphids, or plant-lice, is an ever recurring problem 
to the grower of orchard and bush fruits. Although cereal and 
forage crops furnish perhaps the most striking examples of the 
destruction wrought by aphids, practically no crop is free from 
attack by one or more of these small and delicate insects. During 
the past decade especially, aphid injury to orchard fruits, particu- 
larly the apple, has been on the increase. 
The present bulletin treats of the aphids injurious to fruit and 
foliage of apple, quince, pear, plum, cherry, peach, currant, goose- 
berry, and grape. Forty-one species of aphids in all are discussed. 
The more important forms affecting a given fruit are considered first, 
and then follows a brief account of species known to infest the plant 
locally or occasionally, and which growers should be able to dis- 
tinguish from the more destructive species. In their life history 
aphids are peculiar in many respects, and each species occurs in 
several different forms; for this reason a short account of aphids in 
general is given for the information of readers not familiar with 
these facts. Remedial measures are described at the close of the 
bulletin, since similar treatments are applicable, with some varia- 
tions, for the control of all the species considered. 
1Since the well-known grape phylloxera [Phylloxera vitifoliae (Fitch)] is injurious principally to the 
roots and requires control measures radically different from those employed against foliage-inhabiting 
aphids, it is mentioned only incidentally in this bulletin, although its galls on grape leaves are illustrated 
(fig. 27, p. 36). 
Notr.—This bulletin is ofinterest to orchardists, vineyardists, and growers of currants and gooseberries 
in all parts of the United States. 
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