Woolly Aphis 



135 



purple color and the white, woolly secretions which ap- 

 pear on the upper surface of its body, and from which 

 it derives its name. It lives on the roots and on the tops 

 of apple trees, usually on the smaller roots, and in the 

 forks, and on the smaller branches of the tops. In winter 

 it may entirely disappear from sight on the infested por- 

 tions of the tree above the ground, but on the roots it does 

 not perish, although its reproduction takes place more 



Woolly aphis of the apple. A, winged female; b, wing- 

 less female, and c, a wingless female bearing the peculiar 

 "woolly" secretion characteristic of this insect. 



slowly. A winged brood appears late in the fall, but it has 

 not been determined with certainty whether the females of 

 this brood lay their eggs on the branches or on the soil. 

 The infestation in the spring comes from the fact that the 

 newly born young travel up the trunk to where they find 

 suitable place for lodgment. They cause large smooth 

 knots to form on both the root and branches wherever 

 a colony of them may form, and in cases of severe infes- 

 tation may so seriously injure the roots as to cause them 

 to rot off. 



