INSECTS INJURIOUS TO PEACH, PLUM AND CHERRY 589 



winged females return to the peach and winter host-plants, and 

 give birth to young which develop into wingless females which 

 lay the winter eggs. The true males are winged and migrate 

 from the summer food-plants. 



Control. The trees affected should be sprayed about a week 



FIG. 518. The green peach Aphis (Myzus persicce Sulz.) : 5, adult stem mother; 

 6, young of stem mother; 7, apterous viviparous female of second genera- 

 tion; 8, spring migrant; 9, fall migrant; 10, egg-laying female; 11, eggs 

 all much enlarged. (After Gillette and Taylor.) 



before the buds open with tobacco extract. If the trees are sprayed 

 with lime-sulfur for the twig-borer just before blossoming, it 

 should kill most of the aphids. Tobacco extract may be used on 

 the foliage of affected plants as necessary. 



