Field Tests of Insecticides for Control of the Gulf Coast Tick on Cattle1, 2

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Abstract
Field trials were conducted during July-October, 1974 for the control of adults of the Gulf Coast tick, Amblyomma maculatum Koch, to evaluate the efficacy of insecticides applied as wholebody sprays, ear smears, and ear dusts or dispensed in slow-release devices attached to the ears, horns, or necks of cattle. All sprays provided excellent initial control at 1 day posttreatment, but residual protection diminished rapidly by 1 week posttreatment under heavy reinfestation pressure. Compounds that provided greatest residual protection as sprays were chlorfenvinphos (EC), toxaphene (EC), coumaphos (WP), and dioxathion (EC). Most smears and dusts provided adequate residual protection for about 1 week; however, several smears of chlorfenvinphos formulated in both thin and viscous carriers afforded exceptionally good protection through 2 weeks postapplication. Dichlorvos impregnated in resin strips attached to ear tags provided outstanding protection for 10–12 days; thereafter, tick populations gradually increased. However, the ticks usually attached to the backs of ears away from direct contact with the treated ear tags. Propoxur impregnated in resin and attached to ear tags gave good initial control and variable, but generally poor, control (37–78%) at 10–12 days posttreatment. However, propoxur resin strips applied as neck bands and horn bands gave satisfactory control through 3 weeks against a small, declining population of adult Gulf Coast ticks.

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