INSECTS INJURIOUS TO THE GRAINS AND GRASSES. 89 



food. One of the most important sources of injury is the 

 rotation of one cereal crop with another or with grasses, 

 and the planting of crops in fields that have been allowed 

 to run waste to wild grasses and weeds. As grasses and 

 cereals are the crops most affected by the Fall Army- worm, 

 the soil should always be very thoroughly plowed before 

 planting to any crop, particularly a similar one, and it is 

 inadvisable (not alone on account of the Fall Army-worm, 

 but on account of the numerous other common cutworms, 

 wireworms, and white grubs) to plant wheat, corn, or any 

 other cereal in pasture-land unless a crop which is not so 

 subject to infestation by this insect intervenes. ^^ 



