Abstract
The susceptibility of Aedes albopictus, Culex quinquefasciatus and Cx. boninensis in Ogasawara Is. to eleven insecticides was tested in 1990. For Ae. albopictus, the LC_<50> value of p, p'-DDT was 0.037ppm, malathion 0.107ppm, fenitrothion 0.013ppm, propoxur 2.831ppm, and permethrin 0.0096ppm. For Cx. quinquefasciatus, the LC_<50> values of p, p'-DDT was 1.201ppm, malathion 0.071ppm, fenitrothion 0.014ppm, propoxur 1.617ppm, and permethrin 0.016ppm. For Cx. boninensis, an endemic species of Ogasawara Is., the LC_<50> value of p, p'-DDT was 0.012ppm, malathion 0.021ppm, fenitrothion 0.0096ppm, propoxur 0.6221ppm, and permethrin 0.0054ppm. Culex boninensis is susceptible to all the insecticides tested and the LC_<50> values of nearly all the insecticides were lower than those for Cx. quinquefasciatus and Ae. albopictus.
