幼若ホルモン類似体 methoprene の蚊に対する効果

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The insect growth regulator, methoprene, was evaluated against mosquito larvae in the laboratory. Methoprene, which contains more than 90% of the active ingredient, was diluted with ethyl alcohol, and applied to 20 larvae kept in 250ml of distilled water in a 85×100mm container at 25℃. Granulated larval food was added as required. The individuals which failed to moult into normal pupae or adults were counted every day until all surviving larvae became adults. The following results were obtained. 1. The sensitivity of larvae of Culex pipiens pallens to methoprene varied with the developmental stages (IC)_<50> values were 0.028ppm at the late 3rd-instar and 0.00037ppm at the very late 4th-instar stage. 2. The effects of methoprene to seven species of mosquito larvae, Culex tritaeniorhynchus summorosus, C. orientalis, C. infantulus, Aedes togoi, A. albopictus, A. aegypti and Armigeres subalbatus, were compared. This compound exhibited only moderate activity against six species, but less activity against Armigeres subalbatus. 3. The emergence-inhibiting effects of methoprene (technical ZR-515^<[○!R]>), and its slow-release formulations, SR-10^<[○!R]> and SR-10F^<[○!R]>, persisted for several days to the larvae of C. p. pallens. The field tests were conducted against the natural populations of C. p. pallens breeding in the lotus ponds in the summer of 1974. The larvae in all stages and pupae were numerous at the time of application. The slow-release formulations, SR-10 and SR-10F, were applied by a spray mobile at the rate of 1.0 or 10g of the active ingredient per 100m^2 of the pond surface. Daily pupal collections and bioassay of the treated water were conducted. The treatments at the higher dosage prevented the mosquito emergence from the ponds for 11 days and at the lower dosage for 7 days.
日本衛生動物学会の論文
1975-08-15

幼若ホルモン類似体 methoprene の蚊に対する効果

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