* apa 
WEBWORMS INJURIOUS TO CEREAL AND FORAGE CROPS 
AND THEIR CONTROL. 
By Gro. G. AINSLiZ, Entomological Assistant, Cereal and Forage-Crop Insect 
Investigations. 
CONTENTS. 
Page. Page. 
Injury caused by webworms___-_-_- 3 | Blwe-crass webworm — =. 12 
Webworms and parent moths______ 6 | Black-headed sod webworm________ 12 
feonerdie lite nistory— 222-2 eee 6 | Leather-colored sod webworm______ als | 
Cornroot webworm =—-2- = 2-5 8 | Silver-striped webworm____________ 14 
Serined webworm— 2.2 eS 0 | General control measures__________ 15 
« INJURY CAUSED BY WEBWORMS. 
HROUGHOUT a large area in the middle eastern United States 
_ much damage is done annually by the corn and sod webworms. 
The insects which 
cause this damage are 
often overlooked and 
the injury attributed 
to other causes, but 
their method of work 
is so characteristic 
that once seen it is 
easily recognized 
thereafter. 
The section of the 
country where these 
pests occur and do 
their destructive work 
extends from New 
York and Massachu- 
setts south to North 
Carolina and Tennes- 
see and west to Lowa. 
These limits are 
Vic. 1.—Approximate injurious distribution of webworms roughly indicated on 
in the United States. the map (fig. 1) . jin 
like most of our more destructive insect pests, the webworms are all 
natives of America and have not been introduced from foreign lands, 
_ 75580°—22 3 
