320 PESTS OF ORCHARD AND SMALL FRUITS 
in summer. Spraying with tobacco extract or kerosene emulsion will 
kill them. 
Plant Lice on Peach Foliage 
Two species of plant lice are common on peach foliage. They 
are especially likely to do notable injury in the spring, clustering 
on the tender shoots, curling the leaves, and sometimes dwarfing and 
distorting the forming fruit. 
The Green Peach Aphis (\fyzus persice Sulz.) hatches in early spring 
from eggs laid in crevices of the bark. The first lice are pink, but the 
next generation are light green, often with darker green stripes across 
the abdomen. These in turn give birth to a third brood, many of 
which, unlike the preceding, have wings. 
The latter fly to new food plants, and 
for the next two or three months breed 
on various garden crops, such as to- 
matoes, spinach, cabbage, and many 
others. In the fall another winged gen- 
eration returns to the peach or other re- 
lated trees, and the winter eggs are laid. 
The measures of control are spraying 
with 7 per cent kerosene emulsion or 
with tobacco extract when the lice are 
first observed. 
The Black Peach Aphis (A phis persice- 
niger Er. Sm.) lives the year round on 
peach. It differs from the preceding in 
the fact that colonies are maintained on 
the roots both summer and winter, as 
Fic 493.—The Black Peach well as the colonies on the leaves and 
ie Aerial form. Orig- twigs in summer. The full-grown aphid 
is shining black. Control of this species 
must be directed toward the root-inhabiting forms as well as those 
above ground. In fact the former are often much the more abun- 
dant, while few or none may be seen on the foliage. See page 229. 
