122 IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



this iiisoet is anticipated. In all other counties visited so far, 

 however, there appears to be no possible chance for serious 

 trouble. 



In this paper the writer has attempted to show how the eco- 

 nomic entomologist can determine, with a high degree of ac- 

 curacy, the chance for the abundance of many of our common 

 insects. With such information in hand he is far better able 

 to aid the farmer in his efforts to increase food production. It 

 is probably impossible to anticipate all insects, but with the aid 

 of the machinery at hand, much may be done, and is being 

 done, to raise more and better crops in this national emergency. 

 Department of Entomology 

 Iowa State College 



