The resistance of Dermanyssus gallinae, the red poultry mite, to a pyrethroid acaricide, permethrin, and to an organophosphate, dichlorvos, was examined on five French poultry farms which had experienced problems in controlling mite populations and on one farm with no problems. The concentration of permethrin required to kill 50 per cent of the mites on the five farms was between eight and 40 times the concentration required on the control farm. In contrast, no resistance to dichlorvos was detected. This is the first description of resistance to a pyrethroid in D gallinae in France.
Expérimentation des propriétés antipiroplasmiques de l'Imidocarb sur Babesia canis, agent de la piroplasmose canine en Europe par J. EuzfilJY*, Y. MOREAU**, Mme Claude CHAUVE*, J. GEVREY* et M. GAUTHEY* RÉSUMÉ L'Imidocarb, administré à la dose unique de 3 mg/kg par voie intramusculaire : exerce un effet curatif radical chez les chiens atteints de babésiose clinique et parasitologique caractérisée ; * Ecole Nationale Vétérinaire, Marcy l'Etoile -69260 Charbonnières-les-Bains. ** l.F.F.A.-Mérieux, 254, rue Marcel-Mérieux -69
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