溴虫腈、茚虫威与氟啶脲混配对小菜蛾毒力最佳配比筛选及田间防效研究
Screening of optimum proportion and field effect of mixtures of chlorfenapyr, indoxacarb and chlorfluazuron against Plutella xylostella
吕桂贞1,余明华2,邱浩1,毕道芬1,王一喆1,游红1,李建洪1**
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作者单位：1华中农业大学植物科学技术学院武汉430070；2.湖北省武穴市梅川镇农业技术推广服务中心武穴435400
中文关键词：小菜蛾，氟啶脲，共毒系数，混配，田间防效
英文关键词：wordsPlutella xylostella, chlorfluazuron, cotoxicity coefficient, mixture of insecticides, field effec
中文摘要： 为了延缓小菜蛾Plutella xylostella （L.）抗药性的产生和发展，本研究选用常用的3种化学杀虫剂，即氟啶脲、溴虫腈、茚虫威，采用交互测定法进行了最佳配比的筛选，并根据孙云沛法计算其共毒系数，最后筛选出具增效作用的混配配方，氟啶脲∶溴虫腈（有效成分含量为13.20∶1.72），共毒系数为241；氟啶脲∶茚虫威（有效成分含量为2.20∶3.60），共毒系数为142。田间试验结果表明氟啶脲与溴虫腈混配2 000倍液药后7 d校正防效为84.24%，与其他处理的校正防效具有极显著差异；氟啶脲与茚虫威混配1 000倍液药后7 d校正防效为85.08%，与其他处理的校正防效有显著性差异。
英文摘要： To develop strategies to control the resistance of the diamondback moth (DBM) to insecticides, the effectiveness of mixtures of chlorfluazuron, chlorfenapyr and indoxacarb were evaluated. The results show that a ratio of 13.20∶1.72 chlorfluazuron to chlorfenapyr was optimal and that this blend had synergic action and a cotoxicity coefficient (CTC) of 241. The optimal ratio of chlorfluazuron and indoxacarb was 2.20∶3.60; this also had synergic action and a CTC of 142. Results of field trials indicated that dilute mixtures of chlorfluazuron and chlorfenapyr and chlorfluazuron and indoxacarb reduced DBM abundance by 84.24% and 85.08% respectively 7 days after spraying. These results were significantly greater than those achieved by the other treatments.