16 MONTANA EXPERIMENT STATION BULLETIN 366 



encountered at all elevations up to and including 13,000 feet by various 

 flights through the summer months." 



CROP LOSSES AS A RESULT OF THE MIGRATION.— T h e 17 COUIltieS 



definitely affected by the immigration were Carter, Custer, 

 Daniels, Dawson, Fallon, Garfield, McCone, Petroleum, Phillips, 

 Prairie, Powder River, Richland, Roosevelt, Rosebud, Sheridan, 

 Valley and Wibaux. The aggregate loss for all of these counties 

 was $6,474,191.00 or an average of $380,835.00 per county. 



Thirty-four counties which were affected slightly or not at 

 all by the flight, reported on the grasshopper campaign. The 

 total loss in these counties amounted to $186,923.00 or an aver- 

 age of $5,498.00 per county. 



On the basis of the average loss for these 34 counties, a loss 

 of $280,398.00 might have been expected for the State as a whole 

 had not the July immigration occurred. Actually, however, the 

 total loss for the State amounted to $6,661,114.00. Therefore, the 

 loss which theoretically could be charged against the flight was 

 $6,380,716.00. The loss in the counties affected by the flight was 

 97.2 per cent of the total loss experienced in Montana during 1938. 



Crop Savings During 1938 



In spite of the large amount of crop damage suffered in 1938, 

 savings attributable to the campaign were comparatively high. 

 A total of $1,007,174.00 worth of crops was saved through the 

 expenditure of $31,004.21, or a savings of $32.49 per dollar spent, 

 as compared with the $22.08 saved per dollar spent in 1937. 



TABLE 2.— SUMMARY OF GRASSHOPPER CAMPAIGNS FOR 1937-1938 



1937 193K 



Tons of bait used (dry basis) 2,313 1,574 



Mixing stations 34 39 



Cost of mixing per ton (average) $4.70 $4.30 



Farmers using bait 4,602 3,086 



Acres baited 582,904 



Injury to humans 



Livestock losses 32 21 



Federal expenditure $45,620.25 $24,433.68 



State, county, and local expense (exclusive of 



field labor) $17,133.12 $6,570.53 



Total expenditure $62,753.37 $31,004.21 



Savings ..$1,385,642.00 $1,007,174.00 



Savings per dollar spent $22.08 $32.49 



Losses $2,196,420.00 $6,661,114.00 



Loss per acre injured $2.01 $2.63 



