6 



these grasshoppers. The farmer, having imdertakeii the cultiva- 

 tion of alfalfa in large areas under conditions preeminently favor- 

 able for the development of grasshoppers, must now throw some re- 

 straining element into the other side of the scales in order to j^reserve 

 the balance. It thus comes about that artificial repressive measures 

 must be put into play in order to counteract, as it were, the effect on 



Fig. 6. — A view of grasshoppers dead and dying from fungous disease. Natural size. 



(Prom Howard.) 



nature of a preponderance of alfalfa plants — a vastly greater nujuber 

 than would be produced under natural conditions. And this brings 

 us to a consideration of preventive and repressive measures. 



PREVENTIVE AND REMEDIAL PLEASURES. 



Preventive measures, as here restricted, apply to a period antedat- 

 ing the hatching of the young; while remedial measures are such as 

 deal with the insects after hatching and with methods of destroying 

 them. 



[Cir. 84] 



