title: Control of horn flies on cattle with insecticide pellets fired from a CO2-operated pistol.
abstract: A method is needed to control pyrethroid-resistant horn flies (Haematobia irritans) which would involve the intermittent application of insecticides to cattle without their confinement for treatment. Our objective was to test a CO2 gas-operated pistol, designed to shoot marking pellets, to determine the number of pellet applications required to obtain season-long control. Also, since horn fly resistance to pyrethroid insecticides is widespread, we tested ten other insecticides as concentrates in pellets. Six pellet pistol applications of 38% permethrin provided 84% control of horn flies for 15 weeks. Single pellet applications of ten non-pyrethroid insecticides indicated that none of these insecticides, at the concentrations tested, were as effective as permethrin for control of pyrethroid-resistant horn flies. Our field evaluation of the pellet-pistol method indicates that it has sufficient merit to justify further testing for horn fly control.
authors.affiliation: Kansas State University, Experiment Station, Hays 67601.
authors.forename: T L
authors.initials: TL
authors.lastname: Harvey
authors.forename: J R
authors.initials: JR
authors.lastname: Brethour
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D004478:Ectoparasitic Infestations / Q000517:prevention & control / Q000662:veterinary*; D007300:Insect Control / Q000379:methods*; D007306:Insecticides / Q000008:administration & dosage*; D009117:Muscidae; D026023:Permethrin; D011722:Pyrethrins / Q000008:administration & dosage; D013997:Time Factors
chemical_list: D007306:Insecticides; D011722:Pyrethrins; D026023:Permethrin