应用罩笼法定量评价天敌对麦蚜的控害作用

Effect of suppression of natural enemies on wheat aphids using enclosures in wheat fields

【目的】定量分析麦田自然天敌对麦蚜的控制作用。【方法】系统调查和罩笼接虫法。【结果】龟纹瓢虫Propylaea japonica Thunberg是麦蚜的主要天敌。在麦蚜发生平稳期、盛发期、消退期,自然天敌对麦蚜有稳定的控制作用,控害指数分别为35%、42%和32%。【结论】在制定麦蚜的防治策略时,应充分考虑自然天敌的控害作用,加强对自然天敌的保护利用。

[Objectives] To evaluate the effects of suppressing the natural enemies of wheat aphids. [Methods] Systematic investigation and enclosures. [Results[ The results indicate that Propylaeajaponica Thunberg was the most dominant natural enemy of wheat aphids. Natural enemies could effectively suppress the population of wheat aphids; achieving biocontrol services indices of 35%, 42% and 32% during the aphid population＇s steady period, peak period and decline period, respectively. [Conclusion] The suppression of wheat aphids by natural enemies should be considered as part of the overall wheat aphid control strategy.