82 Farmers’ Bulletin 1128. 
form has a black head and body, with a dark green abdomen marked 
near the tip and on the sides with black. 
As soon as the stem-mother begins to feed, the young leaf begins 
curling about her. As young are produced other leaves are attacked 
until large irregular bunches of twisted leaves occur. Later the 
insects attack the shoots, sometimes thickly covering them. The 
species infests currants, gooseberries, and flowering currants. 
Fia. 24.—The currant aphis: Injury to currant foliage. 
SEASONAL HISTORY. 
The stem-mother hatches from the eggs early in the spring and 
becomes mature early in May. She produces young which are all 
wingless. These in turn produce young which may or may not be 
winged. The winged ones take flight to some unknown summer 
host, while the wingless ones continue the infestation upon the cur- 
rants until nearly midsummer. Jn the fall migrants return to the 
currants and produce young which develop into males and egg-laying - 
females, the latter depositing eggs upon the twigs. 
