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    印楝素对草地贪夜蛾的毒力测定及田间防效

    Indoor toxicity of azadirachtin to Spodoptera frugiperda and its control effect in field

      摘要
    • 摘要:
      目的  评价印楝素对草地贪夜蛾Spodoptera frugiperda的毒力与防效，为草地贪夜蛾的防治提供技术参考。
      方法  采用浸叶法与喷雾法测定了印楝素对草地贪夜蛾的室内毒力和田间防治效果。
      结果  在室内条件下，0.3%(φ)印楝素乳油处理草地贪夜蛾7 d后，2龄和3龄幼虫的LC50值分别为0.59和0.46 mg/L；40%(w)印楝素干粉处理草地贪夜蛾7 d后，2龄和3龄幼虫的LC50值分别为0.93 和0.79 mg/L。0.3%印楝素乳油处理草地贪夜蛾3 d后，2龄和3龄幼虫的AFC50值分别为0.30 和0.12 mg/L；40%印楝素干粉处理草地贪夜蛾3 d后，2龄和3龄幼虫的AFC50值分别为0.53和0.30 mg/L。0.3%印楝素乳油稀释500倍喷雾处理后1、3和7 d对草地贪夜蛾的防效分别达到了24.83%、50.34%和75.50%。
      结论  印楝素对草地贪夜蛾具有较好的毒杀活性与拒食活性，7 d后的防治效果较好；印楝素对草地贪夜蛾的防治具有广阔的应用前景。

       

      Abstract:
      Objective  To evaluate the toxicity and control effect of azadirachtin to Spodoptera frugiperda and provide a technical reference for prevention and control of Spodoptera frugiperda.
      Method  The toxicity and field control effect of azadirachtin on Spodoptera frugiperda were determined by soaking leaf method and spraying method.
      Result  Under indoor condition, the LC50 values of 2nd and 3rd instar larvae were 0.59 and 0.46 mg/L respectively, when treated with 0.3% azadirachtin EC after seven days; At seven days after treated with 40% azadirachtin dry powder, the LC50 values of 2nd and 3rd instar larvae were 0.93 and 0.79 mg/L respectively; At three days after treated with 0.3% azadirachtin EC, the AFC50 values of 2nd and 3rd instar larvae were 0.30 and 0.12 mg/L respectively; At three days after treated with 40% azadirachtin dry powder, the AFC50 values of 2nd and 3rd instar larvae were 0.53 and 0.30 mg/L respectively. When 0.3% azadirachtin EC was diluted 500 times and sprayed on corn, the control effects on S. frugiperda reached 24.83%, 50.34% and 75.50% after 1, 3 and 7 days respectively.
      Conclusion  Azadirachtin has good toxicity and antifeedant activity, and the control effect on S. frugiperda is better at seven days after treatment. Azadirachtin has a broad application prospect in controlling S. frugiperda.

       

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