Aphids Injurious to Orchard Fruits, Etc. 19 
THE MEALY PLUM APHIS.! 
The mealy plum aphis is a common form on plum trees and it can 
be distinguished from the other species attacking plum foliage by 
its uniform green color and the fine, white, powdery covering of 
the body. The honey tubes also differ in that they are very short. 
Fig, 11.—The mealy plum aphis: Infested plum foliage. 
SEASONAL HISTORY. 
These insects feed upon the underside of the leaves, often being 
very closely packed together. (Fig. 11.) As a rule they do not 
curl the leaves, even when present in great numbers. 
The stem-mothers of this species hatch from the winter eggs on 
the plum early in the spring and in about 10 days they are mature. 
\Hyalopterus arundinis (Fab.). 
