INSECTS AFFECTING GRAINS, GRASSES, FORAGE 109 



Where the young hoppers have congregated in large numbers 

 on the edge of fields, in patches of weeds, etc., they may be 

 destroyed by spraying them with kerosene or crude petroleum 

 either pure or, preferably, in an emulsion, and the weeds and 



FIG. 79. Simple coal-oil pan or hopperdozer. (After Riley.) 



FlG. 80. The Price oil-pan or hopperdozer, with partitions to prevent 

 slopping. (After Riley.) 



grass along fences and in neglected fields should be thoroughly 

 treated with a strong arsenical spray or dust. 



In pastures, small grains or any crops permitting their use, 

 immense numbers of the nymphs may be caught by the use 



