Pyrethroid resistance in Australian field populations of the sheep body louse, Bovicola (Damalinia) ovis

Publication Type:Journal Article
Year of Publication:1995
Authors:G. W. Levot, Johnson, P. W., Hughes, P. B., Powis, K. J., Boray, J. C., Dawson, K. L.
Journal:Medical and veterinary entomology
Pagination:59 - 65
Date Published:1995
ISBN Number:0269-283X
Keywords:animals, Australia, cattle, Insecticide Resistance, Lethal Dose 50, lice, Pyrethrum, Research Support, Non-U.S. Gov't, Sheep/parasitology

Synthetic pyrethroid (SP) resistance has developed in Australian field populations of the sheep body louse, Bovicola (Damalinia) ovis. Laboratory bioassays were used to measure the susceptibility of lice to cypermethrin and the other registered SPs. Results of these bioassays indicated resistance to cypermethrin, deltamethrin, cyhalothrin and alphacypermethrin. So far, high-level resistance has been diagnosed in only a few strains. The toxicological responses of these strains were clearly separated from those of the majority of louse strains tested. Furthermore, these strains had survived immersion in commercial SP dips. The level of resistance described in some strains was sufficient to cause pour-on products to fail despite the fact that the LC50s of these strains fell within the normal range of field responses.

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