60 GENERAL SUMMARY. 



In 1891, in Minnesota, more than 200 of these machines were 

 made and used. It was estimated that 5000 bushels of young grass- 

 hoppers were caught with these machines. 



SPRAYING. 



There is one crop which at the time of alfalfa harvest is too high 

 for protection by means of the hopper- dozer ; that is the growing 

 corn. This can be readily protected by driving along the outside 

 corn rows and spraying the corn thoroughly with Paris green, one 

 pound to sixty gallons of water. The insects entering will feed upon 

 the leaves and die. These rows should be sprayed about once a week 

 until the grasshoppers have disappeared. Having neglected to place 

 in my equipment a spraying pump, I was unable to conduct experi- 

 ments and note results. I give this as a remedy without trial, and be- 

 lieve it will prove a sure destruction to all locusts entering the corn. 

 The five or t.en rows of corn thus sprayed had better be removed be- 

 fore the field is pastured. I see no reason, however, why the ears of 

 corn when husked would be in any way dangerous. 



SUMMARY. 



Native grasshoppers require certain conditions for their increased 

 multiplication. The grasshopper prevalent this year is frequently 

 called the yellow locust, better known as the Differential Locust. 



Large areas of undisturbed soil for deposition and protection of 

 eggs, attended by early spring vegetation for nourishment of newly 

 hatched young, are the essential conditions. 



These native grasshoppers, especially the Differential Locust, show 

 decided preference for cultivated ground and roads adjacent to places 

 suitable for oviposition. This Differential Locust, contrary to suppo- 

 sition, does not require soil entirely free from grasses for oviposition, 

 but will sometimes deposit its eggs among the roots of a bunch of 

 buffalo-grass. 



Wheat drilled in stubble or unplowed ground, alfalfa permitted to 

 grow on the same undisturbed ground from year to year, furnish ideal 

 surroundings for the welfare and productivity of native grasshoppers. 



Wherever these conditions are found, in any state in the union, 

 native locusts will appear in numbers directly proportionate to the 

 area containing their required conditions. 



Wheat, oats and barley were not disturbed this season in vicinities 

 where large areas were devoted to alfalfa. 



Differences of opinion exist concerning the best methods of soil 

 culture for wheat. If grasshoppers damage crop, thorough tilling 

 and packing of the soil previous to sowing seed should be the only 

 method used. Unless this is done, harvesters may be produced on 

 the same ground who will reap the rewards. Crop profits are figured 

 from the granary. 



