1. Efficacy of some pyrethroids against a strain of the rabbit ear mite ( Psoroptes cuniculi ): an unusual cross-resistance pattern
- Author
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Edit Bleicher, Peter Sarkozy, Andras Szego, Laszlo Pap, and Róbert Farkas
- Subjects
Insecticides ,Drug Resistance ,Biology ,Cypermethrin ,Toxicology ,chemistry.chemical_compound ,Nitriles ,Pyrethrins ,parasitic diseases ,Animals ,Bioassay ,Carboxylate ,Cross-resistance ,Analysis of Variance ,Mites ,Lagomorpha ,General Veterinary ,Acaricide ,Ear ,General Medicine ,biology.organism_classification ,Molecular biology ,Infectious Diseases ,Deltamethrin ,chemistry ,Insect Science ,Parasitology ,Rabbits ,Ear mite - Abstract
An in vitro immersion bioassay was used to compare the efficacy of selected pyrethroids against a deltamethrin-resistant strain of rabbit ear mite (Psoroptes cuniculi). A lack of cross-resistance between bromo (deltamethrin) and chloro analogues (cypermethrin) of alpha-cyano-3-phenoxybenzyl-dihalovinyl-dimethylcyclopropane carboxylate was detected. Whereas deltamethrin proved to be inactive (48-h mortality 21.9% at 1000 mg/kg), each cypermethrin isomer mixture tested, including alpha-cypermethrin [IR(cis) alpha S + 1 S (cis) alpha R] and theta-cypermethrin [1R(trans) alpha S + 1 S (trans) alpha R] and their mixture at a ratio of 4/6, beta-cypermethrin, showed high efficiency (48-h mortalityor = 95% at 1000 mg/kg).
- Published
- 1997
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