GRASS-HOPPER CONTROL WORK IN IOWA. 



H. E. JAQUES. 



Grass-hopper depredations to farm crops have been of frequent 

 occurrence in Iowa, and figure to a certain extent in the loss account 

 of almost every year in at least some part of the state. Attacks dur- 

 ing the summer of 1918 seem to have been the most extensive of 

 recent years. Early in June the young nymphs were seen in great 





FIGURE 31 



numbers in many of the counties in the southwestern part of the 

 state and a few weeks later they had reached the same stage in the 

 southeastern part of the state. As this indicates, complaints of se- 

 rious damage came first from the southwestern counties, but before 

 the summer had passed grass-hoppers in numbers to demand con- 

 trol were scattered well over the state. It is known that their dam- 

 age was serious in at least forty-two counties, as shown by the ap- 

 pended map. 



As the grass-hopper is not restricted in its choice of food plant, 

 the nature of its damage depends very largely upon what is available 



