ピレスロイド剤抵抗性コガタアカイエカ成虫に対する allethrin 蒸散剤の効果

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Effects of allethrin fumigation against organophosphate- and pyrethroid-resistant female adults of Culex tritaeniorhynchus were studied using commercial electric fumigators developed for the control of mosquitoes in human houses. Adults of susceptible Taiwan and organophosphate resistant Toyama strains were completely knocked down after 3min fumigation (0.05mg allethrin/min) in test chambers (0.504m^3). Only half of the pyrethroid resistant Chinen adults, however, were knocked down at 60min after treatment by the same 3min fumigation. One hundred forty minutes of fumigation is required in an ordinary Japanese room (23.3m^3) to reach the same concentration of allethrin in air achieved by 3min fumigation in a test chamber. This means that allethrin fumigation has significantly lost its effect in controlling the pyrethroid resistant mosquito adults. After 6min fumigation, KT_<50> for the Taiwan, Toyama and Chinen strains were 2.8,4.5 and 12.0min, respectively. Taiwan adults were completely killed by 3min fumigation, whereas the mortalities of Toyama and Chinen adults were only 65.6 and 28.1%, respectively, even after 12min fumigation. The possible development of pyrethroid resistance in Culex tritaeniorhynchus, which inhabits paddy fields, is discussed in connection with the increasing use of pyrethroid insecticides in these fields to control rice pests. It is also warned that the development of kdr-type pyrethroid resistance in this species makes most household insecticides totally ineffective, because they are almost composed of pyrethroids.
日本衛生動物学会の論文
1991-03-15

ピレスロイド剤抵抗性コガタアカイエカ成虫に対する allethrin 蒸散剤の効果

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