PLATE 25 
A. —Rhode Island Greening apples deformed by Aphis malifoliae. 
B. —Apple twigs twisted by colonies of Aphis malifoliae: Beginning of twisting. 
C. —Apple twigs twisted by colonies of Aphis malifoliae: Twisted twig. 
D. —Winesap apples deformed by A Mis malifoliae . 
64311°—16- i 
