42 APPLIED ENTOMOLOGY 



problems, and here Economic Entomology and Practical Agriculture 

 have failed to work as closely together as should be the case, and our 

 present methods for controlling field crop insects are less effective than 

 with most others. 



The same thing is true with our forests. The shade tree can be 

 sprayed if that is a desirable treatment, but the spraying of forests even 

 if practicable from the standpoint of expense, is frequently impossible 

 because of the nature of the ground on which the forest stands, density of 

 growth and other factors, and other and more indirect methods of insect 

 repression then must be resorted to. 



