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Abstract
Abstract Fenvalerate ear tags (SD 43775, 8% ai) were attached to 22 adult cows in two herds on May 1’78. RabonR ear tags (SD 8447, 13.7% ai) were attached to 15 adult cows in one herd on May 17’78. All animals were tagged in both ears. None of the 23 calves in the three treatment herds was treated. Six herds of similar size with no fly treatment constituted the control. Horn and face flies were counted on the face and one side of the animals with the aid of binoculars. Half of the calves in all herds were treated for cattle grubs on Sept 12’78 with famphur pour-on. This apparently caused the sharp reduction in horn fly numbers in the untreated herds on Sept 19’78.
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