672 Grasses and Leguminous Crops in New York 



the advent of cold weather when they go into hibernation among 

 the roots of grasses. 



Control. As a grass pest the army-worm is more likely to 

 become injurious in fields that have been for several years in sod. 

 Trouble may be avoided by adopting a system of crop rotation 

 by which the land is not left in sod for more than two or three 

 years. In case the caterpillars have assumed the army-worm 

 habit, their advance may be stopped by plowing a furrow across 

 their line of march with the vertical side of the furrow toward 



(Kiiielit p into) 



Fig. 615. A Furrow Along the Edge of a Corn Field to Stop an 



Invasion of Army Worms. 



the crop to be protected (Fig. 615). Post holes should be dug at 

 intervals in the bottom of the furrow into which the caterpillars 

 will fall as they crawl along while attempting to climb out of the 

 furrow. Here they may be crushed or killed with kerosene oil. 



Army-worms may also be destroyed by using a poison bait 

 made according to the following formula : 



Bran, 20 pounds; paris green, 1 pound; molasses, 2 quarts; 

 oranges or lemons, 3 fruits; water, about 31/2 gallons. 



