HOW TO DETECT OUTBREAKS OF INSECTS AND SAVE GRAIN. 7 



the edge of the field, running the land side of the plow toward the 

 field to be protected. In dry weather the sides of the furrow can 

 be made so smooth and the sides so steep that the bugs will find it 

 easier to crawl along the bottom than to climb up the sides. Circular 

 holes from 30 to 40 feet apart, made with a post-hole digger, then 

 may be dug in the bottom of the trench. Into these holes the bugs 

 will fall in large numbers, and here they may be killed easily by 

 sprinkling kerosene oil over them. A log dragged back and forth 



FIG. 4. Corn plant infested with chinch bugs. When the bugs are as numerous as this 

 on the coin it can not be saved. Do not let them reach the corn. 



along the furrow is useful in keeping the bottom and sides in good 

 condition during dry weather. In wet weather a line of liquid tar 

 or crude petroleum, which the bugs will not cross, may be maintained 

 in the furrow bottom. 



Spraying for chinch bugs has not proved successful except on a 

 small scale and when conducted by an expert, the difficulty being 

 that the substances which kill the bug are almost sure to kill the corn 

 also. The thing to do is to <//>'//,</ th-c buys before they reach the 

 corn and keep them out of it ~by the 'methods described above. 



