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Nerve insensitivity as a mechanism of resistance to pyrethroids in a japanese colony of houseflies


, : Nerve insensitivity as a mechanism of resistance to pyrethroids in a japanese colony of houseflies. Journal of Pesticide Science 12(1): 71-78

The quantitative response of femur motor nerve preparations of two Japanese colonies, Mashiko and Mashiko-res10, of pyrethroid-resistant houseflies [Musca domestica] was electrophysiologically compared with that of kdr, super-kdr and susceptibile CSMA strains by applying several pyrethroids and DDT to the exposed thoracic ganglia of the flies. The ganglia of the Japanese strains were far less sensitive to both DDT and all Types I and II pyrethroids tested than those of the susceptible strain. Nerve response of the Mashiko-res10 strain was similar to that of kdr or super-kdr strains. A quantitative difference was observed among the resistant strains in response to pyrethroids, but not to DDT. Pretreatment with the oxidase inhibitor piperonyl butoxide or the DDT-dehydrochlorinase inhibitor DMC did not alter the latency of appearance of symptoms and the firing frequency in motor nerve of the Mashiko-res10 strain. It is concluded that nerve insensitivity plays a significant role in resistance to both pyrethroids and DDT in this Japanese strain of the housefly, although a possible involvement of other factor(s) can not be excluded.

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