CHAPTER XXV 



INSECTS INJURIOUS TO THE APPLE AND PEAR 

 The Woolly Apple-aphis * 



THE Woolly Aphis is one of the most destructive pests of 

 young apple orchards, and as it works mostly upon the roots it 

 often escapes detection until the tree is badly injured or killed. 



FIG. 443. The woolly apple-aphis (Eriosoma lanigera Hausm.): a, agamic 

 female; 6, young nymph; c, last stage of nymph of winged aphis; d, 

 winged agamic female with enlarged antenna above all greatly enlarged 

 and waxy excretion removed. (After Marlatt, U. S. Dept. Agr.) 



The aphids will be found clustered in bluish-white, cottony 

 masses, looking like patches of mold, on the smaller twigs, par- 

 ticularly water-sprouts, and around wounds or scars on the trunk 



* Eriosoma lanigera Hausmann. Family Aphididoe. See C. L. Mar- 

 latt, Circular 20, Div. Ent., U. S. Dept. Agr.; R. I. Smith, Bulletin 23, Ga. 

 State Board of Ent.; Gillette and Taylor, Bulletin 134, Colo. Agr. Exp. Sta., 

 p. 4; C. P. Gillette, Journal of Economic Entomology, Vol. I, p. 306; A. C. 

 Baker, Report 101, U. S. Dept. Agr., and B. R. Leach, Bulletin 730, U. S. 

 Dept. Agr. 



