APPLE INSECTS 



153 



The Woolly Aphis of the Apple 



Schizoneura lanigera Haiismann 



Practically wherever the apple is grown in any part of the 

 world, there may often be found during the summer on the 

 trunk, branches and water-sprouts above ground and on the 

 roots also bluish- white, cottony patches (Fig. 164) consisting 



Fig. 164. 



The woolly aphis, a cluster of lice on an apple twig showing the 

 white woolly covering. 



of many small, reddish-brown plant-lice or aphids scarcely one 

 tenth of an inch in length. Above ground the bodies of the 

 aphids are nearly covered by a woolly mass of long, waxy fibers 

 that are much shorter on the root-inhabiting aphids, and 

 gives them a whitish mealy appearance. Although for many 

 years considered as distinct species and now often discussed 

 as different forms, the aphids living underground on the roots 

 and those on the branches or trunk are absolutely identical 



