92 CORN INSECTS AND DISEASES 



cornfield by plowing a ditch, and maintaining a dust barrier in the 

 ditch by dragging a log or harrow to and fro. 



Birds and Rodents. Crows pull up green corn to secure the 

 grain as food. They do damage principally in regions where the 

 corn area is comparatively small. Scarecrows of various kinds will 

 keep them away, if placed close enough together. Coal tar on the 

 seed is a deterrent, though not a sure preventive. The tar is applied 

 by dipping a wooden paddle in the hot tar and stirring in the seed 

 corn until each grain is coated. It may be necessary to add a little 

 meal, sand, or sawdust to keep the corn from sticking. 



QUESTIONS 



1. Name the important corn insect enemies working below ground. 



2. Can you suggest methods of control ? 



3. What important insects work above ground? 



4. Can you suggest methods of controlling crows and rodents? 



