5种杀虫剂对入侵害虫椰子织蛾的室内毒力测定

Toxicity bioassay of five insecticides to Opisina arenosella Walker(Lepidoptera: Coleoptera),an invasive pest

椰子织蛾是一种外来新入侵害虫，对棕榈科植物造成了严重危害。采用叶片浸渍法测定了甲维盐等5种杀虫剂对入侵害虫椰子织蛾5～6龄幼虫的室内毒力。5种药剂处理72 h后的室内毒力大小顺序为甲维盐＞氯虫苯甲酰胺＞毒死蜱＞高效氯氟氰菊酯水乳剂＞烟碱；72 h 致死中浓度（ LC50）为5．2604、9．7126、24．8202、104．0584、643．1496 mg· L-1。选取同样毒力效果所需成本依次为毒死蜱＜甲维盐＜高效氯氟氰菊酯＜氯虫苯甲酰胺＜烟碱。本研究可用于指导椰子织蛾的应急化学防控。综合毒力和成本，建议在生产上采用毒死蜱和甲维盐等相关药剂防治椰子织蛾。

Background Opisina arenosella Walker, a new invasive insect, caused serious economic losses to palm plants .[Method]By the method of leaf immersion , the toxicities of 5 insecticides to 5th-6th instars larvae of O.arenosella was tested under labo-ratory conditions.[Result]After 72 h of exposure, the most toxic compound was emamectin benzoate , followed, in decreasing order, by chlorantraniliprole,chlorpyrifos, lambda-cyhalothrin, and nicotine.The lethal concentration （LC50） values were 5.2604 mg· L-1, 9.7126 mg· L-1, 24.8202 mg· L-1, 104.0584 mg· L-1, 643.1496 mg· L-1 respectively.To reach an identical level of toxici-ty, the cheapest compund was chlorpyrifos , followed by, in increasing order, emamectin benzoate, lambda-cyhalothrin, chlorantra-niliprole and nicotine .[Conclusion and significance]When there is a need for emergency control of O.arenosella on the basis of tox-icity and cost , we recommended to use chlorpyrifos and emamectin benzoate for controlling O.arenosella .