吡虫啉和啶虫脒对东亚小花蝽捕食行为和能力的影响

Effects of Imidacloprid and Acetamiprid on Predation Behaviorand Capacity of Orius sauteri

为明确吡虫啉和啶虫脒对天敌东亚小花蝽捕食行为和能力的影响,通过玻璃管药膜法用田间推荐使用剂量处理东亚小花蝽雌成虫,分析了这两种安全性较高的杀虫剂对东亚小花蝽雌成虫捕食行为、捕食量和捕食功能反应方程参数的影响。结果表明,经吡虫啉和啶虫脒处理后,东亚小花蝽雌成虫捕食行为中的搜寻、行走和取食时间分别显著减少了100.0 s和332.5 s、775.0 s和500.0 s、1117.5 s和1145.0 s;对棉铃虫卵的日捕食量分别为(4.89±1.36)和(3.56±0.73)粒,分别显著减少了1.55和2.88粒。各处理组对棉铃虫卵的捕食功能反应均符合HollingⅡ模型,但模型的各项参数均发生了变化,吡虫啉和啶虫脒处理后的捕食效能(分别为10.7363和7.0280)与最大寻找效应(分别为0.6139和0.4021)均显著低于对照(26.1909和0.7929)。因此,在田间推荐使用剂量下,吡虫啉和啶虫脒均可干扰东亚小花蝽捕食行为,减少其捕食量,并显著降低东亚小花蝽雌成虫捕食效能和寻找效应,对东亚小花蝽有显著的负面影响,这为协调天敌与杀虫剂科学使用、促进烟田害虫的可持续治理提供理论依据。

In order to clarify the effects of imidacloprid and acetamiprid on the predation behavior and capacity of the natural predator of Orius sauteri,the female adult of O.sauteri was treated with the field recommended application dose by the method of residual film in glass tube,and the effects of these two insecticides on the predation behavior,predation amount,predation function response and searching efficiency were determined.The results showed that the predation behavior time of female adult was inhibited by the recommended application dose of imidacloprid and acetamidine.The searching,walking and predation time of female adult is significantly reduced by 100.0 and 332.5 s,775.0 and 500.0 s,1117.5 and 1145.0 s,respectively.The predation amount treated with imidacloprid and acetamidine was(4.89±1.36)and(3.56±0.73)eggs,respectively,which was significantly reduced by 1.55 and 2.88 eggs than that of the control.The predation of the female adult of O.sauteri on eggs of Heliothis assulta in the two treatments followed Holling type Ⅱ functional response,while certain changes occurred in the parameters of the model.The predation efficiency(10.7363 and 7.0280,respectively)and search effect(0.6139 and 0.4021,respectively)of female adult of O.sauteri treated with imidacloprid and acetamidine was significantly lower than that of the control(26.1909 and 0.7929).In conclusion,the recommended field application dose of imidacloprid and acetamiprid presents negative effects on the predation behavior,and significantly reduce the predation efficiency and search effect of female adult of O.sauteri.The research might provide a theoretical basis for coordinating the scientific utilization of natural enemies and insecticides,and promoting the sustainable management of pests in tobacco fields.