短时高温对黑肩绿盲蝽捕食褐飞虱卵的影响

Effects of short-term exposure to high temperature on predation of the eggs of Nilaparvata lugens Stal by Cyrtorhinus lividipennis Reuter

为明确夏季高温条件下,黑肩绿盲蝽对褐飞虱卵的控害潜能,本研究通过在人工气候箱内分别设置最高温度为30、33℃和36℃的渐进式变温处理,测定黑肩绿盲蝽各龄若虫及成虫对褐飞虱卵的捕食量、捕食功能反应及搜寻效应。结果表明,在提供充足食物的条件下,不同温度处理间黑肩绿盲蝽对褐飞虱卵的日均捕食量无显著差异;不同高温处理下,黑肩绿盲蝽捕食功能反应均能与HollingⅡ模型较好拟合,不同龄期若虫及成虫的瞬时攻击率和处理时间在不同温度之间均差异不显著,其中1龄若虫和2龄若虫在36℃处理下日最大理论捕食量最大,分别为2.924粒和12.195粒;在不同高温处理下,黑肩绿盲蝽对褐飞虱卵的搜寻效应均随着卵密度的增加而降低。本研究结果表明,短时高温未对黑肩绿盲蝽的控害作用产生不利影响。

The aim of this study was to determine the potential of Cyrtorhinus lividipennis Reuter in controlling the eggs of Nilaparvata lugens Stal under high temperature in summer.The predation amounts,predation functional response and searching efficiency of C.lividipennis to N.lugens eggs were determined by setting up variable temperatures with the maximum temperatures of 30℃,33℃and 36℃in an artificial climate incubator.The results showed that there was no significant difference in the average daily predation amount under adequate food supply.The predation functional response of C.lividipennis fitted with HollingⅡmodel under different high temperatures.The instantaneous attack rate and handling time of C.lividipennis had no significant difference among different temperatures.The maximum daily prey consumption of the 1st-and 2nd-instar nymphs was 2.924 and 12.195 eggs,respectively.Under different high temperatures,the searching efficiency of C.lividipennis for N.lugens eggs decreased with increasing egg density.The results suggested that the short-term exposure to high temperature had no adverse effect on the pest control capability of C.lividipennis.