牧草盲蝽对棉蚜的捕食作用

The predation of Lygus pratensis (L.) to Aphis gossypii Glover

本文从室内和田间两方面评估了牧草盲蝽对棉蚜的捕食作用。室内研究发现,不同虫态的牧草盲蝽对棉蚜的捕食功能反应均符合HollingⅡ型方程;捕食量随棉蚜密度的增加而增大,也随着自身龄期的增大而增大;4龄若虫、雌成虫与雄成虫三者间的捕食量没有明显差异,但均显著高于2龄若虫。田间罩笼试验同样表明,牧草盲蝽对棉蚜具有一定的捕食作用。

In this study, the predatory capacity of Lygus pratensis （L.） on Aphis gossypii Glover was assessed in the laboratory and under field condition. The results showed that the functional response closely approximated to Holling II type. Predatory capacity of L. pratensis increased with the increasing prey density and its own increasing nymphal development stages. No significant difference was found among the predation capacity of the 4th instar nymphs, female adults and male adults, but all of which were significantly higher than that of the 2na instar nymphs. In cotton fields, L. pratensis also could predate A. gossypii.