隐蔽施药对苹果黄蚜的防治效果及其对天敌影响

The control effect of concealed pesticide application on Aphis citricola and its effects on natural enemies

为明确化学药剂对北京市玉渊潭公园中苹果蚜虫的防治效果,建立隐蔽施药系统,采用树干挂瓶引注法比较了噻虫嗪和吡虫啉2种杀虫剂对苹果黄蚜的防治效果,比较了噻虫嗪根施法和树干挂瓶引注法对苹果黄蚜的控制效果,并观察了不同药剂处理对天敌种群数量的影响,明确了捕食性优势天敌种群。研究结果表明:采用树干挂瓶引注法,70%噻虫嗪水分散粒剂施药后7 d对苹果黄蚜的最高防效为65.78%;采用根施法,3%噻虫嗪颗粒剂施药后21 d对苹果黄蚜的最高防效为64.65%。苹果黄蚜天敌有5种,优势种群分别为异色瓢虫、大草蛉、食蚜蝇、蚜茧蜂,数量分别占29.35%、27.98%、23.11%和12.96%。噻虫嗪和吡虫啉的隐蔽施药行为对捕食性天敌相对安全。

In order to clarify the control effects of pesticides on aphids in Beijing Yuyuantan park,a concealed pesticide application system was established,and the control effects of thiamethoxam and imidacloprid against Aphis citricola were compared by trunk hanging bottle injection method,the control effects of thiamethoxam on Aphis citricola using root application method and trunk hanging bottle injection method were compared.The effects of different treatment agents and concentrations on the population of natural enemies were observed,and the predatory dominant natural enemy population was clarified.The results showed that the maximum control effect of thiamethoxam 70%WG on Aphis citricola was 65.78%on the 7th day after application by trunk hanging bottle injection method.The maximum control effect of thiamethoxam 3%GR on Aphis citricola was 64.65%on the 21th day after application by root application.The investigation found that there were five natural enemies of Aphis citricola,and the dominant natural enemies were Harmonia axyridis,Chrysopa pallens,Syrphidae and Aphidius,accounting for 29.35%,27.98%,23.11%and 12.96%,respectively.The concealed application of thiamethoxam and imidacloprid was safe for predatory natural enemies.