NAKED WORMS EATING THE LEAVES 173 
The winter is passed as half-grown larvie in the ground. In the 
spring these larve transform, moths emerge, and in a few weeks another 
generation of worms is at work. 
It is this generation that is apt 
to reach such numbers as to 
prove a serious pest. In the 
North there are three broods in 
a season; in the South five or 
six. Normally the insect is held 
down to moderate numbers by ; 
2 Fig. 197.— Adult of the Army Worm. 
its natural enemies. Original. 
When the worms reach ex- 
cessive abundance and begin to travel from one field to another, 
invasion may be stopped by plowing three or four furrows, and main- 
taining a thick dust in these if possible. As worms collect in the 
furrows they may be killed with a drag, or by sprinkling them 
with kerosene or kerosene emulsion. Another measure sometimes 
advisable is to apply a heavy dose of Paris green to a_ strip 
a few yards wide on the side of the field that is threat- 
ened. Or poison bran mash 
may be used. It is advis- 
able to plow in the fall fields 
in which the worms have 
been numerous in late sum- 
mer, in order to destroy as 
Fig. 198.—The Fall Army Worm. Slightly many of the hibernating 
enlarged. Original. larvee as possible. 
The Fall Army Worm (Laphygma frugiperda 8. and A.) 
This species is related to the “ army worm,” but whereas the latter 
reaches its periods of occasional destructive abundance in the early 
summer months, the fall army worm becomes a pest in the latter part 
of the summer, usually in August. The full-grown worm is dark in 
color, about 14 inches long, and has a yellowish stripe down the 
middle of its back. Within this stripe, on each segment, are four 
