Larvicidal and ovipositional preference test of copper solution for mosquitoes

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  • REZA Mohamad
    Division of Medical Zoology, Jichi Medical University Department of Biology, Faculty of Medicine Andalas University
  • YAMAMOTO Daisuke S.
    Division of Medical Zoology, Jichi Medical University
  • MATSUOKA Hiroyuki
    Division of Medical Zoology, Jichi Medical University

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  • 銅溶液を用いた蚊の幼虫殺滅試験および産卵指向性試験

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In the previous studies, we demonstrated that larvae of Anopheles stephensi died within two weeks after the exposure of the larvae to 2.4 ppm of copper solution. The ability of copper to kill mosquito larvae prompted us to examine its applicability to ovitraps. We demonstrated in this study that 10 ppm of copper killed more than 90% of larvae (Anopheles stephensi, Aedes albopictus and Culex pipiens pallens) in 96 hours. At 3.3 ppm, Cx. pipiens was more sensitive than An. stephensi and Ae. albopictus. Fifty percent of Cx. pipiens larvae died within 24 hours but An. stephensi and Ae. albopictus survived more than 50% at 48 hours. We also observed that gravid mosquitoes of An. stephensi, Ae. albopictus, and field-collected An. sinensis did not detect nor avoid 10 ppm copper solution for laying eggs under laboratory conditions. These results suggest that copper could be used in ovitraps as a low cost alternative and the eradication of mosquito-borne diseases.

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