小菜蛾对氯虫苯甲酰胺抗药性与田间防治效果的相关性研究

Study of the relationship between resistance to chlorantraniliprole and efficacy of control of the diamondback moth(Plutella xylostella)

【目的】明确小菜蛾Plutella xylostella(L.)田间种群对氯虫苯甲酰胺抗药性变化与田间防治效果的相关性。【方法】2011—2015年在田间进行了氯虫苯甲酰胺防治小菜蛾田间药效试验,并测定了该地小菜蛾田间种群对氯虫苯甲酰胺的敏感性。【结果】氯虫苯甲酰胺在相同剂量下对小菜蛾田间防治效果从2011的97.74%下降到2015年的63.53%;而小菜蛾对氯虫苯甲酰胺的相对毒力指数从2011年的1上升到2015的11.93。【结论】小菜蛾对氯虫苯甲酰胺的敏感性与其抗药性总体上呈现负相关。

[Objectives] To investigate the relationship between resistance to chlorantraniliprole and efficacy control of Plutella xylostella（L.）. [Methods] The susceptibility of P. xylostella larvae to chlorantraniliprole, and the control efficacy of this insecticide, were evaluated in the field. [Results] The control efficacy of chlorantraniliprole on P. xylostella fell gradually from 97.74% in 2011 to 63.53% in 2015, and the relative toxicity ratio increased from 1 in 2011 to 11.93 in 2015. [Conclusion] These results indicate that resistance and control efficacy are generally inversely correlated.