Difference in the larval susceptibility to pyriproxyfen in nine colonies of six vector mosquito species

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  • SATHO Tomomitsu
    Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University
  • TSUDA Yoshio
    National Institute of Infectious Diseases
  • SOMBOON Pradya
    Department of Parasitology, Faculty of Medicine, Chiang Mai University
  • KAWADA Hitoshi
    Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University
  • TAKAGI Masahiro
    Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University

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  • 6種9系統の疾病媒介蚊におけるピリプロキシフェンに対する幼虫の感受性の性差について

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Abstract

The susceptibility of mosquito larvae against pyriproxyfen was examined in the laboratory for 9 colonies of the following six species; Aedes aegypti (Linnaeus), Ae. albopictus (Skuse), Anopheles dirus Peyton and Harrison, An. minimus Theobald, Culex pipiens pallens Coquillett, Cx. tritaeniorhynchus Giles. The late fourth instar larvae were exposed to different concentrations of pyriproxyfen for 24 hours, then the number of dead or emerging pupae collected within 2 days after exposure were counted by sex. A higher susceptibility of males than females to pyriproxyfen was observed for all colonies. The comparison of IC_<50> among the three Ae. aegypti colonies showed that susceptibility of the Ae. aegypti RR colony, which is resistant to DDT and permethrin, was lower than that of other colonies.

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