Treatment of One Beef Animal per Herd with Permethrin for Horn Fly Control123

Abstract
Unrestrained cattle were treated on summer pasture with a CO2-propelled hand sprayer operated from a pickup truck by the driver. Treatment of an individual bull, cow, or steer per herd (10–32 head) with permethrin EC spray (0.1–2.0% AI) eliminated all horn flies, Haematobia irritans (L.), from the herds within one day, usually with 90–100% reductions for at least one wk.

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