306 SCHOOL ENTOMOLOGY 



as soon as the buds burst in the spring. During the mid- 

 summer the aphides are more common on the roots, partic- 

 ularly on the smaller and more tender roots. 



The Green Peach-aphis * is well described by its name. 

 The winter is passed in the egg stage on any of the stone 

 fruit trees. The first generation in the spring is a deep pink 

 color, but the second and third are yellowish-green. Aphides 

 of the third generation are winged and are about one- 





A/.7 



FIG. 220. The black peach-aphis (Aphis persicce-niger Er. Sm.). 

 (After Gillette and Taylor.) 



Winged viviparous female; young female, first instar; apterous viviparous 

 female much enlarged. 



twelfth inch long, with the head, antennae, thorax, honey- 

 tubes, a large spot on the center of the abdomen and smaller 

 spots in front of the honey-tubes, blackish. This third gen- 

 eration migrates to various common succulent vegetables 

 such as cabbage, rape, turnip, tomato, celery and a long list 

 of food plants, being troublesome in greenhouses the year 

 round. In the fall, migrants return to the peach. Injury 

 to the peach seems to have been most common in the South- 

 west, though it has been observed in other sections. 

 * Myzus persicce Sulz. 



