4种生物源农药对甘薯小象甲的室内毒力测定

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中图分类号：S476 文献标识码：A 文章编号：0488-5368（2025）07-0083-06

Determination of Indoor Toxicity of Four Biogenic Pesticides Against Cylas formicarius

LEI Tingl，NIU Yonghao，XU Yuanchang，LEI Rongjun ，TANG Guowen

1.YanglingVotioal&echicalCge，Yanglingaaioin;lgeofantProtetio/tateKybtoo ConservationandUtilizationofBio-Resources inYunnan，YunnanAgricultural Uniersity，Kunming，Yunnan65O2o1China; 3.Heyang Agricultural TechnologyExtensionCenter，Weinan，Shaanxi7153Oo，China）

Abstract：To evaluate the indoor toxicity levels and provide a scientific basis for the green control of Cylas formicarius inthe field，this study investigated the laboratory eficacyoffour biogenic insecticides-matrine，rotenone，azadirachtin，and avermectin-using three bioassay methods：immersion，dipping，and film residue.All four compounds exhibited insecticidal activity against adult weevils，with toxicity levels generally increasing over time.Among the treatments，avermectin showed the highest toxicity in the immersion method，with a 72-hour LC50 value of 65.75mg/L ，followed by matrine （ 172.97mg/L ），rotenone（210.73 mg/L），and azadirachtin （297.07mg/L ）.In contrast，when using the dipping method，rotenone and azadirachtin exhibited lower LC 50 （2 values than avermectin and matrine，indicating higher toxicity.In the film residue assay，avermetinagain demonstrated the greatest toxicity.Although the three methods yielded diffring results，the filmresidue method generallyresulted inlower toxicitylevelsforallcompounds.Thisstudyprovides essentialdata forthe potentialapplication of these four biogenic insecticides in the sustainable management of C. formicarius.

Key Words ： Cylas formicarius;； Matrine； Rotenone; Azadirachtin; Avermectin;Toxicity determination

甘薯小象甲（Cylasformicarius）属于鞘翅目Coleoptera三锥象科Brentidae害虫，可危害多种旋花科作物，但仅在甘薯上完成生活史[1]。（剩余6072字）