title: Control of headfly on sheep.
abstract: Eighteen different treatments against sheep headfly (Hydrotaea irritans) were tested on Scottish blackface and Swaledale ewes and lambs. Gamma-HCH + paradichlorobenzene gave consistently better control than crotoxyphos cream. Pyrethroids in sprays or incorporated into eartags were relatively ineffective. Pyrethroid pour-ons gave good control, but in a year of low headfly attack they were not as effective as HCH + paradichlorobenzene. Liveweight gain was improved by treatment with HCH + paradichlorobenzene and significantly improved by treatment with deltamethrin pour-on.
mesh_terms: D000287:Administration, Topical / Q000662:veterinary; D000818:Animals; D001835:Body Weight; D004175:Diptera; D004478:Ectoparasitic Infestations / Q000517:prevention & control / Q000662:veterinary*; D007306:Insecticides / Q000627:therapeutic use*; D009570:Nitriles; D009943:Organophosphorus Compounds / Q000627:therapeutic use; D011722:Pyrethrins / Q000627:therapeutic use*; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control*
chemical_list: D007306:Insecticides; D009570:Nitriles; D009943:Organophosphorus Compounds; D011722:Pyrethrins; C017160:cypermethrin; C017180:decamethrin; C000518:crotoxyphos; C017690:fenvalerate