Abstract

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Author(s):: WANG Hai-jian1; JIANG Chun-xian1; CHEN Yao1; LI Qing1; YANG Wen-yu1; XU Xiang2; YANG Qun-fang1; JIANG Su-rong; (1.College of Agronomy,Sichuan Agricultural University,Chengdu 611130,China;2.Plant Protection Station,Sichuan Agricultural Bureau,Chengdu 610041,China)

Keywords:: Coccinella septempunctata L.; Aphis glycines; Functional response; Intraspecies interference

Abstract:: The effects of predator density,intraspecific interference and temperature on the predation function ofCoccinella septempunctata L.were studied in the laboratory to make clear the predation ofCoccinella septempunctata L. on Aphis glycines in Sichuan.The results showed that the functional response of C.septempunctata on A.glycines was belonging to Holling-Ⅱ and the regression equation was N_a=1.191N_t/(1+0.005 26N_t).The predatory function of C.septempunctata on A.glycines was affected by the density of C.septempunctata, the average amount of prey consumed decreased with the increase of prey density,the Watt equation was A=21.9P^-1.75.There was intraspecies interference among adult C.septempunctata and the interference regression equation was E=0.169P^{-0.027 7}.Temperature had great influence on predation.The maximum search rate was at 30℃.