大眼长蝽对苜蓿盲蝽的捕食作用

室内条件下,评价了大眼长蝽Geocoris pallidipennis(Costa)对苜蓿盲蝽Adelphocoris lineolatus(Goeze)的捕食效应。结果表明,大眼长蝽捕食苜蓿盲蝽的有效虫态为3～5龄若虫及成虫,其中成虫的捕食率最高。大眼长蝽对苜蓿盲蝽的捕食功能反应符合HollingⅡ型,其捕食量随着猎物龄期的增长而减少,而随着自身龄期的增长而增加。24h内,大眼长蝽雌成虫最多能捕食37.88头苜蓿盲蝽1龄若虫。15～35℃范围内,大眼长蝽的捕食量随着温度的升高而增加;35℃下的捕食量为15℃下的1.78倍。上述研究表明,大眼长蝽是苜蓿盲蝽的重要捕食性天敌。

Predation of Geocoris pallidipennis on Adelphocoris lineolatus

The predatory potential of Geocoris pallidipennis（Costa）on Adelphocoris lineolatus（Goeze）was assessed in the laboratory.G.pallidipennis began to prey on A.lineolatus after the latter had entered the 3rd instar.The predatory responses of G.pallidipennis to A.lineolatus were of the Holling Ⅱ type.Predation of G.pallidipennis on A.lineolatus declined with increasing developmental stage of the latter,but increased with its own developmental stage.During one 24 h period,adult female G.pallidipennis could,at most,consume 37.88 1st instar nymphs of A.lineolatus.In addition,the predation rate gradually increased with temperature from 15 ℃ to 35 ℃,being 1.78 times higher at 35 ℃ than at 15 ℃.These results indicate that G.pallidipennis is a potential biological control agent for A.lineolatus.