Aphids Injurious to Orchard Fruits, Etc. 25 
PEACH APHIDS. 
THE GREEN PEACH APHIS.' 
The green peach aphis is a common form upon peach trees. The 
stem-mothers in spring, as well as the fall egg-laying females, are 
often pinkish, and at other times light green. The wingless agamic 
form also is light green, while the ed individuals have a Seer 
head and body and a large dark-brown patch on the abdomen. This 
marking occurs upon both the spring migrant and the fall migrant. 
They are similar in other respects, excepting that the fall fom has 
the honey tubes somewhat swollen. 
On the peach this species feeds entirely upon the leaves, on which 
the insects may be found in large numbers crowded on the under- 
side. (Fig. 17.) It has a large number of other food plants, 
including numerous garden vegetables. 
Fic, 17.—The green peach aphis: Colony on underside of peach leaves. Much enlarged. 
SEASONAL HISTORY. 
The eggs of this aphid are laid upon the peach twigs, and early in 
the spring before the buds are opened the green stem-mothers are 
hatched. From this form during the spring may be produced one or 
more generations of wingless individuals upon the leaves. Spring 
migrants, however, begin to occur very early and continue to appear 
until the middle of June. These fly to a large number of different 
plants, where numerous generations occur throughout the summer. 
During September and October fall migrants are developed which 
return to the peach, where they deposit the young egg-laying females. 
These are fertilized by the winged males, which also have returned 
to the peach, and the females ‘thea lay their eggs upon the twigs. 
Occasionally, however, migrants are found Jae es do not return to 
the peach, and these denonit egg-laying females upon the summer 
host plants. 
1 Myzus persicae (Sulz.). 
