Cattle, Horn Fly Control with Synthetic Pyrethroid Insecticides Applied as Sprays and Dusts, 1977

ICI PP 557 (ECTIBAN) and Burroughs-Wellcome BW 21Z were each applied as 0.025% or 0.05% sprays to cattle at two different locations. At a third location, ECTIBAN (0.25%) and BW 21Z (0.5% and 1.0%) were applied as dusts. In each study, a herd of cattle was sprayed with 0.125% dioxathion (standard), and at the first and third locations, an untreated control was used. Cattle in spray treatments received ca. 2.84 liters/animal of finished spray while those in dust treatments received ca. 5.7g/animal/day of dust from double thickness burlap bags hung beneath open sheds which provided the only shade in the pastures. Horn flies were counted in early morning on one side of the animals with the aid of binoculars. Random counts were made on 10 animals/herd. Horn fly counts are given as total flies per animal averages.