PLANT-LICE INJURING THE FOLIAGE 317 
The Rosy Apple Aphis (Aphis sorb’) hatches from eggs that have 
remained on the apple throughout winter, but with the third generation 
migrates to other food 
plants. This is a slightly 
larger species. The wing- 
less female is one tenth of 
an inch long, bluish in 
color, and has yellow honey 
tubes tipped with black. 
The winged female has a 
black thorax and a red ab- 
domen. 
The European Grain 
Aphis (Stphocoryne arene) 
is found in summer on 
small grains, but for the 
most part migrates in the Fic. 487.— Adults of the Apple Aphis clus- 
tered along veins of leaf. Enlarged. Orig- 
fall to apple, pear, or re : 
inal. 
lated trees, where its win- 
ter eggs are laid. It develops in the spring like the preceding 
species, leaving the fruit 
trees with the coming of the 
third generation. On apple 
trees it is commonly first 
observed clustered on the ex- 
panding buds. 
The Clover Aphis (Aphis 
bakert) rears its summer gen- 
erations on clover or alfalfa. 
These lice are light yellow or 
pink. Usually they leave 
the clover in the fall, passing 
through a winter egg stage 
on apple or pear. The first 
Fic. 488.— Work of Aphis on young fruit. : : 
Original. generation from these eggs 
