Insecticides for Control of the Cattle Tick and the Southern Cattle Tick on Cattle1

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Abstract
Twenty-seven insecticides applied to artificially infested cattle as sprays and 3 applied as sprays and dips were evaluated for control of the cattle tick, Boophilus annulatus(Say), and the southern cattle tick, B. microplus (Canestrini). Effectiveness was determined by inhibition of production of viable eggs by female ticks that were adults or nymphs at the time of treatment. A 0.06% coumaphos suspension was used as a standard of comparison for the sprays; the following materials were equal to or more effective than the standard: 0.25% Bay 37341 (O, O-diethyl O-[4-(methylthio)-3,5-xylyl] phosphorothioate), 0.25% Bay 39007 (O-isopropoxyphenyl methylcarbamate), 0.25% bromophos-ethyl, 0.3% Ciodrin® (alpha methylbenzyl 3-hydroxycrotonate dimethyl phosphate), 0.15% dioxathion, 0.1% Dowco® 175 (2,4-dichlorophenyl propyl methylphosphoramidate), 0.1% Dursban® (O, O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate), 0.1% fenthion, 0.125% Imidan® (O, O-dimethyl S-phthalimidomethyl phosphorodithioate), 0.45% Shell SD-8447 (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate), and 0.1% Shell SD-8448 (2-chloro-1-(2,4,5-trichlorophenyl)-vinyl diethyl phosphate). Freshly charged vats containing 0.25% carbaryl or Shell SD-8447 controlled ticks satisfactorily; the same insecticides were less satisfactory after 6 weeks of aging and moderate use. Outstanding control was obtained throughout 42 weeks with Dursban in a vat which contained 0.11% active ingredient initially and 0.03% finally.