异色瓢虫对桃粉大尾蚜、桃一点斑时蝉捕食选择性研究

Predatory selectivity of Harmonia axyridis on Hyalopterus amygdali and Erythroneura sudra

研究了异色瓢虫对２种猎物捕食选择性．结果表明，异色瓢虫对桃粉大尾蚜有明显的喜好性；对桃一点斑叶蝉有明显的负喜好性．猎物单独存在时，异色瓢虫对各猎物功能反应为ＨｏｌｌｉｎｇⅡ型，当两种猎物同时存在时，如果一种猎物密度较小时，异色瓢虫对另一种猎物功能反应仍为ＨｏｌｌｉｎｇⅡ型，另一种猎物密度较大时，异色瓢虫对桃一点斑叶蝉的功能反应属ＨｏｌｌｉｎｇⅢ型，对桃粉大尾蚜功能反应为ＨｏｌｌｉｎｇⅡ型。

Studies on the predatory selectivity of Harmonia axyridis show that it has a positive preference to Hyalopterus amygdali, but a negative one to Erythroneura sudra. When one of these preies exists alone, the functional response of H.axyridis shows the HollingⅡtype. When both of them exist simultaneously, but one′s density is less,the functional respones of H. axyridis on another prey still shows the Holling Ⅱ type.If one prey has a higher density. the functional response of H. aryridis shows the Holling Ⅱ type on E.sudra ,but the Holling Ⅱ type on H. amygdali.