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Evaluation of Cyfluthrin Pour-On Treatment for Control of Flies on Dairy Cattle, 1990


 Nineteen dairy heifers (wt 250 kg) and 11 dairy cows (wt 500 kg) in separate pastures at the Beltsville Agricultural Research Center were treated with a 1% cyfluthrin pour-on treatment on 31 Jul and 24 Aug. Treatment was applied by syringe along the backline; heifers and cows received 8 ml and 12 ml of the pour-on, respectively. Fly density was determined by making weekly counts of face flies/face, horn flies/side, and stable flies on front legs. Two pretreatment and 6 (heifers) or 8 (cows) posttreatment counts were made.