Abstract
AbstractPermethrin is not a repellent against horn flies Haematobia irritans (L.). The flies were able to land but not rest or feed on cattle treated with a spray or a pour‐on application of permethrin, because the insecticide had a quick toxic effect. During the 15 days after treatment, all of the 813 flies exposed to the steer treated with the spray, died without taking a blood meal. During the same period, all but two of the 1426 horn flies died when exposed to the steer treated with the pour‐on application, and only one of the living and seven of the dead horn flies had taken a blood meal.
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