局所施用による薬剤感受性検定におけるアリモドキゾウムシの麻酔方法とfenitrothionに対する感受性

概要

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The effect of chilling and CO2 anesthesia on sweetpotato weevils was investigated to optimize the immobilization duration sufficient for topical application of insecticides. Two-minute CO2 anesthesia treatment with simultaneous chilling for the latter half of the time immobilized the weevils for about 100 seconds. This duration is sufficient to topically apply insecticides to the weevil bodies. This anesthesia method did not adversely affect the survivorship of weevils. Using this anesthesia method, we investigated the susceptibility to fenitrothion (MEP) of wild weevil populations on Kikai Island, where MEP and synthesized sex pheromone had been applied for 3 years and on Amami Oshima Island where no control measures were implemented. The LD50 values were as low (about 4.0–8.0 μg/g) for sweetpotato weevils collected from Kikai Island as for weevils collected from the control, Amami Oshima Island (about 2.5 μg/g). This result suggests that the weevil-controlling measures on Kikai Island are working satisfactorily.
日本応用動物昆虫学会の論文