THE MONTHLY BULLETIN. 



71 



Life History. — The life history of this species is very imperfectly 

 known. The eggs laid upon the trees the previous fall hatch in the 

 spring about blossoming time and the young lice at once begin to attack 

 the young leaves and fruit. The work upon the leaves is similar to 

 that of the green apple aphis, causing them to curl and turn yellow. 

 The work upon the fruit is even more destructive, causing deformity 

 and non-maturity. In most of the apple growing sections of the State 

 the attacks of this louse have been exceedingly severe. About June 

 the species leaves the fruit trees and migrates to unknown host plants 

 and does not return until fall in time to give birth to the true sexual 

 forms, which produce the over-wintering eggs. As in the case of green 

 apple aphis many successive and overlapping broods occur each year. 



Distribution. — Widely distributed in practically every apple grow- 

 ing section of the State. 



Food Plants. — Especially attacks the foliage and young fruit of the 

 apple, but also works upon the hawthorn and Sorhus sps. 



Fig. 57. — The lui)ine aphid (Macrosiphuin albifroiis Essig) 

 on wild lupine. (Essig, P. C. Jr. Eat.) 



