338 Bulletin 81 



factory method of distributing the bait is to sow it from the rear end of 

 a buggy." Farmers in the Rucker district of the Sulphur Spring Valley 

 report that th?y have secured best results from poisoning by putting out the 

 poisoned bait between 1 1 a. m. and 1 1 p. m. At this time of day, during 

 the hot and dry days, the grasshoppers seem unusually thirsty and will 

 travel a long distance for the moist bait. 



Hopperdozers: Grasshoppers are found usually in large bunches soon 

 after hatching out. If these are discovered before they begin to fly they 

 can be exterminated cheaply by the use of 'hopperdozers,' provided con- 

 ditions are favorable for their use. (For further information on hopper- 

 dozers see Timely Hint No. 104 of the Arizona Experiment Station). 



When grasshoppers are hatched out in areas that contain much dried 

 grass, the pests may be destroyed by burning off the grass. A circle on 

 the outside should first be set on fire so that the hoppers cannot escape. 



In regions where grasshoppers are likely to occur the people should 

 keep a strict lookout in the spring and early summer in order to determine 

 where they first appear, so that control measures may be applied before the 

 young grasshoppers begin to fly or destroy vegetation. Clubs should be 

 formed for this purpose and regular reports made by the members in order 

 that there may be community cooperation. 



REFERENCES 



For further reference and reading matter on the subject of agricultural 

 and range pests the reader will find the following publications very interest- 

 ing and instructive : 

 Farmers' Bulletin No. 335 : Harmful and Beneficial Mammals of the 



Arid Interior. 

 Farmers' Bulletin No. 702 : Cottontail Rabbits in Relation to Trees and 



Farm Crops. 

 Farmers' Bulletin No. 670: Field Mice as Farm and Orchard Pests. 

 Farmers' Bulletin No. 369: How to Destroy Rats. 



Farmers' Bulletin No. 587 : Economic Value of North American Skunks. 

 Farmers' Bulletin No. 747 : Grasshopper Control. 

 Bureau of Biological Survey Bulletin No. 20: Coyotes in their Economic 



Relations. 

 Bureau of Biological Survey Bulletin No. 40: A Systematic Account of the 



Prairie Dogs. 

 Bureau of Biological Survey — Circular No. 61 : Hawks and Owls from 



the Standpoint of the Farmer. 

 Reprint from Yearbook for 1907. U. S. Department of Agriculture. 

 The Rabbit as a Farm and Orchard Pest. 



