title: Ivermectin cattle pour-on: duration of a single late spring treatment against horn flies, Haematobia irritans (L.) (Diptera: Muscidae) in Missouri, USA.
abstract: Late spring treatment of cattle with a single dose of pour-on ivermectin (0.5 mg kg-1 body weight) resulted in reduced horn fly populations for approximately 6 weeks, with percentage efficacy exceeding 80% for at least 26 days post-treatment. Bioassay with house flies of dung from treated cattle demonstrated suppression of fly emergence for 11 days post-treatment. The subsequent increase in horn fly numbers on the treated herd was predicted by a developmental rate equation interpreted by the time of cessation of larval fly inhibition in field dung.
authors.affiliation: Department of Entomology, University of Missouri, Columbia 65211.
authors.forename: S E
authors.initials: SE
authors.lastname: Marley
authors.forename: R D
authors.initials: RD
authors.lastname: Hall
authors.forename: R M
authors.initials: RM
authors.lastname: Corwin
mesh_terms: D000287:Administration, Topical; D000818:Animals; D001681:Biological Assay; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy*; D004478:Ectoparasitic Infestations / Q000188:drug therapy / Q000662:veterinary*; D005260:Female; D006793:Houseflies; D007559:Ivermectin / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000627:therapeutic use*; D008297:Male; D008923:Missouri; D009117:Muscidae
chemical_list: D007559:Ivermectin