THE KOSY APPLE APHIS. 

 {Aj>hls iJKillfoIix Fitch.) 

 The rosy apple aphis (fig-. H), regarded by Pergande as A2-)his rnali- 

 follm Fitch, and determined by Sanderson as Aphis sorhl Kaltenbach, 

 is readih' distinguished f roni the preceding by its larger size, rounder 

 bod}', and usually rosy color, which, however, may vary from salmon 

 to tan or even to slaty gray or black, the body being covered with a 

 whitish pulverulence. This species is very generally distributed in 

 the United States, occurring in such widely separated States as Illi- 

 nois, Connecticut, New Jersey, Virginia, Washington, California, 

 South Carolina, and West Virginia; it occurs also in Canada. The 

 species is common on apple, but has been taken by Sanderson on pear. 



Fig. 6. — Rosy apple aphis (Aphis malifoliR'): a, winged agamic form; 6, pupa: c, wingless agamic 

 form; d. recently born aphis. All greatly enlarged (original). 



In Europe the food plants of Aphis sorhi^ in addition to apple, are 



t'rataiguso.vyacantha^ Soi'husduciqxiria^ S. d()///e.stir<(,'dnd S. torminaUs. 



LIFE mSTOKV. 



The life history of this species is but imperfectly known. Winter 

 eggs are deposited in the autumn by sexual females, and more often 

 on the trunk and larger limbs than with the other species mentioned. 

 They hatch in spring as the a})ple leaves are pushing out, and the young 

 aphides infest the 3'onng leaves and later the tender shoots and foliage, 

 the latter thus becoming usually badly curled. Three generations from 

 the egg are said to occur on the apple in the spring, many individuals 

 of the second and third generations developing wings and migrating 

 to other trees and to other host plants. After tiie third generation 

 the apple is deserted by the insects until fall, when the return migrants 

 appear and give rise to the true sexual forms, the females depositing 

 eggs as described. 



[Cir.Sl] 



