Effect of insecticidal ear tags on populations of lice (Damalinia ovis) infesting sheep.
Polymer matrix ear tags containing 13.7% w/w tetrachlorvinphos or 8.5% w/w cypermethrin were applied to Merino wethers infested with lice and carrying two months wool. The cypermethrin tags reduced louse numbers by a maximum of 89% in comparison to controls at 16 weeks after treatment and by 85% at the conclusion of the experiment 38 weeks after application. Lice were not eradicated from any sheep. The number of lice counted on sheep treated with tetrachlorvinphos-impregnated tags was not significantly different from controls.
James
P J
PJ
Department of Agriculture, Adelaide, South Australia.
Meade
R J
RJ
Powell
D
D
D000704:Analysis of Variance; D000818:Animals; D003692:Delayed-Action Preparations; D007306:Insecticides / Q000008:administration & dosage / Q000627:therapeutic use*; D010373:Lice Infestations / Q000188:drug therapy / Q000517:prevention & control / Q000662:veterinary*; D008297:Male; D011722:Pyrethrins / Q000008:administration & dosage / Q000627:therapeutic use*; D012756:Sheep; D012757:Sheep Diseases / Q000188:drug therapy* / Q000517:prevention & control; D013751:Tetrachlorvinphos / Q000008:administration & dosage / Q000627:therapeutic use*
D003692:Delayed-Action Preparations; D007306:Insecticides; D011722:Pyrethrins; C017160:cypermethrin; D013751:Tetrachlorvinphos