ts Farmers’ Bulletin 1282. . 
large seed companies in California, applying as high as 100 pounds 
per acre of a 10 per cent dust and covering 3 to 4 acres per hour. 
Fic. 7.—Treating a pea field infested by pea aphis with a one-horse duster. 
Fic, 8.—One-horse type of duster in use against pea aphis. 
Because of the present high cost of the dust and the fact that 
a high percentage of nicotine is required to effect control, dusting 
for the pea aphis can only be applied to especially valuable crops, 
