Additional Tests with Insecticides for the Control of the Tropical Horse Tick on Horses in Florida

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Abstract
In limited tests topical applications of 0.3% Ciodrin (alpha-methylbenzyl 3-hydroxycrotonate dimethyl phosphate) in cottonseed oil or water, or 5% Ciodrin dust; 0.1% Shell Compound 4072 (2-chloro-l-(2,4-dichlorophenyl) vinyl diethyl phosphate) in cottonseed oil or water, or 5% Shell Compound 4072 dust; 0.25% Imidan (O,O-dimethyl S-phthalimidomethyl phosphorodithioate) in cottonseed oil or water; and 0.25% coumaphos in cottonseed oil or water, or 5% coumaphos dust, were highly effective in killing all stages of Dermacentor nitens Neumann in ears of horses. Dri-die (silicon dioxide plus ammonium silicofluoride to extent of 3% fluorine) failed to control the ticks. A treatment of 1% lindane in corn oil was less effective in preventing reinfestation of ears by larvae than the same concentration of insecticide in cottonseed, mineral, or olive oil. Of 15 treatments administered to horses in feed to systemically control the ticks, only trichlorfon at 20 mg/kg per day for 10 days was completely effective. Treatments administered for shorter periods failed to kill ticks in molting periods.

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