6 Circular 107 



Hatching occurs in the early spring ; the young aphids reach al- 

 most full growth by the time the blossoms open. When maturity is 

 reached these lice are deep pink in color and begin to give birth to 

 pale yellowish-green young that retain this color throughout their 

 lives. These pale green specimens attack the foliage of the peach, 

 causing it to curl and sometimes to fall. 



The young produced by this second generation develop wings 

 and distribute themselves over a large variety of vegetable crops. 

 By the middle of June the lice have disappeared from the trees. 



Generation follows generation throughout the summer. All are 

 females and all bear living young. In the late fall (late October and 

 early November) the winged forms leave the vegetables and return 

 to the trees, and possibly certain weeds, where the true males and fe- 

 males are produced and the over-wintering eggs laid. 



Fig. 3 



The Green Pea Aphis 



1 — Adult winged female ; 2 — Immature female ; 3 — Adult wing- 

 less female 



Green Pea Louse 



(Macrosiphum pisi Kalt) 

 The green pea louse passes the winter as an egg upon clovers, 

 vetch and alfalfa. Hatching occurs in the early spring (late March 

 in Central Illinois) and the early generations are passed thereon. 

 Winged forms appear early and migrate to the peas when the plants 

 are 6 to 8 inches high. All specimens throughout the spring, sum- 

 mer, and early fall are females and when mature capable of bearing 

 living young. 



