A preliminary investigation into resistance to synthetic pyrethroids by the sheep biting louse (Bovicola ovis) in New Zealand
New Zealand Veterinary Journal, Volume 45, Issue 1, pp 8-10, Feb 1997
Article class: Scientific Article
Subject Terms: Agricultural compounds, Animal remedies/veterinary medicines, Disease/defect, Inflammation, Integument/skin/wool/hair/fur/feather, Parasites - external, Pest/pesticides, Treatment/therapyTaylor and Francis
AbstractIncreasing reports of failure of synthetic pyrethroids for the control of Bovicola ovis on sheep lead to a preliminary investigation into the insecticide resistance status of this pest during 1994. Eighteen strains of lice from North and South Island flocks experiencing failure of synthetic pyrethroid treatments to control lice were exposed to cypermethrin (high-cis) in a treated surface (contact) bioassay. Lice from a group of hermit sheep were chosen as a reference susceptible strain against which resistance of field strains was measured and resistance factors (RFs) calculated. Low to moderate resistance to cypermethrin (high-cis) was demonstrated, with RFs ranging from 1.0 to 12.4.
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