蠋蝽对灰茶尺蠖幼虫的捕食能力及种内干扰反应OA北大核心CSTPCD

To explore the biological control potential of Arma chinensis,a predatory insect,against Ectropis grisescens larvae,the predation and search effect of 4th-5th instar Arma chinensis nymphs and female adults on 3rd-5th instar larvae of Ectropis grisescens were measured in the laboratory,and the intraspecific interference effects of 5th instar Arma chinensis nymphs and female adults were also studied. The results show that both the nymphs and the female adults of the 4th-5th instar Arma chinensis had predatory ability to the larvae of the 3rd-5th instar of Ectropis grisescens,and the functional response equation of predation was in accordance with the Holling Ⅱ model.At different developmental stages of Arma chinensis,the female adults had the highest (33.042) control effectiveness to the larvae of Ectropis grisescens,the second is the 5th instar nymphs (23.222),and the lowest in the 4th instar nymphs (13.219). The female adults had a control effectiveness of 33.042 against the 3rd instar of Ectropis grisescens,the maximum predation of female adults,5th and 4th instar nymphs of Arma chinensis on the 3rd instar larvae of Ectropis grisescens were 41.499,37.178 and 31.602. The instantaneous attack rate (0.793) of the female adults of the Arma chinensis on the 3rd instar Ectropis grisescens was the highest,and the prey processing time for was shortest (0.024 d),indicating that the female adult of the Arma chinensis had the strongest potential to prey on the 3rd instar Ectropis grisescens larvae. The search effect of the Arma chinensis on the larvae of Ectropis grisescens increased with the decrease of the prey density. The search effect of Arma chinensis was as follows:female adults>5th instar nymphs>4th instar nymphs. The intraspecific density of the 5th instar nymphs and female adults of Arma chinensis interfered with the predation of the Ectropis grisescens,and the intraspecific interference of the 5th instar nymphs was less than that of the female adults.