Tests of Acaricides for Control of Boophilus annulatus and B. microplus12

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Abstract
In laboratory tests, 4 strains (3 from Mexico and 1 from Texas) of the southern cattle tick, Boophilus Microplus (Canestrini), were not resistant to 9 commonly used acaricides. “Solubilized” formulations of both chlorpyrifos (2 lb/gal) and Compound 4072 (2-chloro-1-(2,4-dichlorophenyl) vinyl diethyl phosphate) (8 lb/gal) were as effective as emulsifiable formulations. Of 18 acaricides sprayed onto cattle artificially infested with B. microplus and with the cattle tick, B. annulatus (Say), 16 were applied at concentrations that afforded > 99% control of either or both species. Sprays of an 8 lb/gal and a diluent-free formulation (both solubilized) of Compound 4072 afforded > 99% control of both species at 0.02–0.025%. In dipping vat lests, a solubilized formulation (1 part AI:1 part Triton® X-100) of Compound 4072, after an initial charge of 0.1%, was still effective at 126 wk postcharge (end of test) though the vat contained only 0.0051% AI. Phosmet (Imidan®) in the vat at 0.25% caused poisoning in cattle but was effective for 68 wk at a concentration of 0.003% though not at 79 wk at a concentration of 0.001%.

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