THE FALL ARMY WORM, OR ‘‘GRASS WORM.’’ 15 
SUMMARY OF CONTROL MEASURES. 
(1) Provide yourself with a spraying apparatus and keep on hand 
several pounds of some standard insecticide such as arsenate of lead, 
arsenite of zinc, or Paris green. 
(2) Watch carefully the grass growing among the cultivated field 
crops in the bottom lands or in the low places of the fields and upon 
the first indication of the presence of these caterpillars apply poison 
spray as recommended in this bulletin. 
Fie. 18.—Ditch prepared to entrap marching army worms. A log, dragged back and 
forth through the ditch, crushes the worms that have fallen into it. (Walton.) 
(3) In case of a general invasion, after the caterpillars have gone 
down into the ground in order to change to the next stage, which is 
the pupa, give the ground a light cultivation, wherever this is pos- 
sible. This will cause the death of many of the fall army worm 
pupe. 
(4) When the caterpillars are on the march, or are starting in on 
one corner of a field of grain, head them off by plowing a deep fur- 
row directly in front of them. Then kill the larve falling into this 
furrow by dragging a log through it. Where the whole field is in- 
fested, plow a furrow around it so as to keep the worms out of the 
surrounding fields. Keep the furrows free from rubbish so that the 
larve will have no means of crossing to the farther side. 
