40 INSECTS OF ECONOMIC IMPORTANCE 



The apple-crain aphid' (Rhopalosiphinu 



pniJiifoUac) 



Order — Hemiptera 



This a[)hid is a European insect and has been 

 observed on more than twenty-two plants — apple, 

 pear, quince, plum, rye, oats, wheat, et al. ; it is one 

 of the early aphids appearing in the spring on apple 

 buds but usually leaves the apple without doing 

 much harm; it is light green in color with a dark 

 line down the middle of its back. 



Passes winter as dark eggs on branches; these 

 hatch in spring; may be several generations on 

 apple leaves; the winged generation flies to grasses 

 where many generations are produced during the 

 summer; many live on wheat in fall; the winged 

 females finally fly back to the apple tree in the fall 

 and produce a generation of wingless egg-laying 

 females which lay the winter eggs on the l3ark. 



Control — See green apple aphid. 



The rosy apple aphid ^ {Aphis sorhi-A. mali- 



foliac) 

 Order — Hemiptera 



The rosy aphid is larger than the grain aphid and 

 is usually of a rosy color although individuals may 

 be tan, grey or blackish, while the body is covered 

 with a whitish powder ; the body is noticeably glob- 

 ular; this aphid is often very injurious. 



It winters as eggs upon the trunk and branches 

 of the apple tree ; the eggs hatch in spring and prob- 

 ably three and perhaps more (depending on lati- 

 tude) generations are produced on the apple tree; 

 in late June winged individuals begin to leave the 



7 Baker and Turner— U. S. Dept. Agr., Jr. Agr. Res., Vol. i8, 

 p. 311. 



Davis— U. S. Bii. Ent., Bull. ii2. 

 ^ Quaintance — U. S. Bu. Ent., Circ. 8i. 



Matheson — Cornell Univ. Expt. Stat., Memoir 34. 



