304 



SCHOOL ENTOMOLOGY 



The life history is much like the last species, except that the 

 third generation in the spring is winged and migrates to some 

 unknown food plant, upon which it subsists during the sum- 

 mer and from which it migrates back to the apple in the fall. 

 Its injury to the apple foliage is similar to that of the last 

 species, but when over-abundant it ssems to be even more 

 injurious to the young fruit. 



The Oat-aphis * (6) is found on the apple, pear and 



quince in the spring and 

 fall and on small grains 

 and grasses. The wing- 

 less females are distinctly 

 smaller than the previous 

 species and are of a light 

 green color, marked with 

 transverse diamond- 

 shaped bands of darker 

 green across the abdom- 

 inal segments. The 

 honey tubes are shorter, 

 and are distinctly en- 

 larged at the middle and 

 flared at the tip. The 

 winged females may be 

 distinguished from those of the other species by the very 

 short second fork of the median vein at the tip of the 

 fore wings. The second and third generations in the spring 

 are winged and migrate to small grains and grasses. In 

 the fall many of the aphides return to the apple on which 

 the winter eggs are laid, while others pass the winter at the 

 base of the grain plants, except in the far North. This spe- 

 cies does not curl the foliage of the apple so badly and seems 

 * A phis avence Fab. 



FIG. 218. The rosy apple-aphis, 

 wingless, viviparous female greatly 

 enlarged. 



