174 PESTS OF GARDEN AND FIELD CROPS 
small dark dots. There is a rather dark stripe down each side of 
the body. 
Frequently this species is abundant without developing the instinct 
of marching in “armies.” It feeds on alfalfa, sugar beets, and many 
other field and garden crops. Winter 
is passed as pupa in the ground. 
There are two broods in the North; 
four in the South. 
Control depends on the nature and 
extent of the crop attacked. In 
; limited areas apply arsenicals. In 
Big: Pees Seaot Fall Jarge fields the worms may be killed 
by crushing them with a heavy roller. 
Fall plowing and disking, combined with cultivation where feasible, 
will kill many of the overwintering forms. 
The Beet Army Worm (Laphygma erigua Hbn.) 
In some of the Western states this species has periods of disastrous 
abundance on sugar beets. Its invasions occur at the same time as 
those of the fall army 
worm. The larva 
resembles the latter, 
but lacks the distinct 
black dots. Oneach 
side there is a dark 
stripe, along the 
lower edge of which 
is a series of white 
dots. The winter is 
passed as an adult 
moth. There are 
two broods in the summer, and apparently the normal food plants 
Fic. 200. — Adult of the Beet Army Worm. 
Slightly enlarged. Original. 
are certain weeds. Clean culture is indicated, in order to keep down 
the weeds on which the species may live in spring or fall. The 
worms may be poisoned by applying Paris green or arsenate of lead. 
