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中国农学通报

中国农学通报 ›› 2008, Vol. 24 ›› Issue (12): 396-400.

所属专题： 园艺

• 植物保护 农药 • 上一篇    下一篇

应用叶片保护率评价阿维菌素对小菜蛾的毒力

田素芬,顾晓军,刘文静,王德辉   

  • 收稿日期:2008-09-17 修回日期:2008-09-20 出版日期:2008-12-05 发布日期:2008-12-05

Toxicity assessment of avermectin on diamondback moth, Plutella xylostella (Linnaeus), by means of leaf protection rate

Tian Sufen, Gu Xiaojun, Liu Wenjing, Wang Dehui   

  • Received:2008-09-17 Revised:2008-09-20 Online:2008-12-05 Published:2008-12-05

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摘要： 研究目的】尝试采用叶片保护率评价阿维菌素对小菜蛾（Plutella xylostella (Linnaeus)）2龄、3龄幼虫的毒力，以期为该药毒力的准确评价提供资料。【研究方法】浸叶法测定阿维菌素对小菜蛾2龄、3龄幼虫室内毒力的同时，观察记录24h、48h、72h校正死亡率、叶片保护率【结果】对小菜蛾2龄幼虫，24h、48h、72h的LC50分别为>10.00mg/L、2.87mg/L、0.56mg/L；相同时间内PC50分别为0.25 mg/L、0.82mg/L、1.43mg/L。对3龄幼虫，24h、48h、72h的LC50分别为>10.00mg/L、6.20mg/L、3.00mg/L；相同时间内PC50分别为<0.16mg/L、0.04mg/L、4.25mg/L。【结论】根据叶片保护率，可以发现阿维菌素对小菜蛾影响快，但是当阿维菌素毒力达到稳定时，必须有较高的校正死亡率，否则达不到理想的叶面保护效果。

关键词: 糙米粉, 糙米粉, 精米粉, 直链淀粉含量（AC）

Abstract: [Objective] To provide data for toxicity assessment of avermectin on diamond back moth, Plutella xylostella (Linnaeus), the leaf protection role of avermectin was studied. [Method] The toxicity was tested by leaf-dipping method and the corrected mortality and leaf protection rate at 24h、48h or 72h were calculated.[Results] For the 2nd instar larvae, the LC50s at 24h、48h and 72h were >10.00mg/L、2.87mg/L and 0.56mg/L, respectively. The PC50s at the respective duration were 0.25 mg/L、0.82mg/L and 1.43mg/L, respectively. Meanwhile, for the 3rd instar larvae, the LC50s at 24h、48h and 72h were >10.00mg/L、6.20mg/L and 3.00mg/L, respectively. The PC50s at the respective duration were 0.25 mg/L、0.82mg/L and1.43mg/L, respectively. [Conclusion] Based on the leaf protection rate, the effect of avermectin on the tested insects came out quickly after tratment. But the corrected mortality should reach a high level while the toxicity became stable, otherwise the leaf protection effect would not be well enough.