Horn Fly Control with Chlorinated Insecticides1

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Abstract
.-DDT 0.5% and 1.0% and CS-708 0.5% applied at the rate of 2 quarts per animal were the most effective of several insecticides tested as residual sprays for horn fly control in Wyoming. Each gave approx. 4 weeks protection and were superior to dieldrin, heptachlor, Q-137, sulfoxide-pyrethrins, and Toxaphene at the concentrations used. The protection period was not appreciably prolonged by increasing the concn. of DDT from 0.5% to 1.0%, by the addition of 0.03% gamma isomer of BHC to 0.5% DDT, or by the addition to Toxaphene and DDT of fused bentonite sulfur at the rates of 1 and 3 lb. per 100 gal. water. There was no evidence of insecticide resistance in horn flies on herds that have received treatment in 7 of the past 8 years.

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