关键词：
异色瓢虫显明变种;荻草谷网蚜;禾谷缢管蚜;选择指数
摘 要：
在实验室条件下,在特定空间内,测定异色瓢虫显明变种对两种蚜虫荻草谷网蚜和禾谷缢管蚜不同密度值下的捕食量。结果表明,荻草谷网蚜和禾谷缢管蚜种群数量同步增加时,EG-S值和EI值变化是从1到∞,EI值是在0到+1范围内依次增加,表明异色瓢虫显明变种喜好捕食荻草谷网蚜明显高于禾谷缢管蚜;荻草谷网蚜数量不变,禾谷缢管蚜数量增加时,EG-S值和EI值是从+1到0,EI值从-1到0范围内依次减少,表明异色瓢虫显明变种明显喜好捕食禾谷缢管蚜;禾谷缢管蚜数量不变,荻草谷网蚜数量增加时,EG-S值和EI值变化从+1到∞,EI值在0到+1范围内依次增加,表明异色瓢虫显明变种明显喜好捕食荻草谷网蚜。捕食量结果同选择指数。
译 名：
Selectivity of Harmonia axyridis(Pallas) Var.Spectabilis to Macrosiphum Avenae and Rhopalosiphum Padi
作 者：
ZHANG Yue 1,JING Weixia 2,WANG Tao 3,LIU Xiutang 4,QU Aijun 1(1.College of Plant Protection,Shandong Agricultural University,Tai'an 271018,China. 2.College of Agronomy,Shandong Agricultural University,Tai'an 271018,China. 3.Forestry Bureau of Liaocheng City,Liaocheng 252000,China. 4.College of Chemistry and Material Science,Shandong Agricultural University,Tai'an 271018,China)
关键词：
Harmonia axyridis(Pallas) var.spectabilis;Macrosiphum avenae;Rhopalosiphum padi; selective coefficient;predatory quantity
摘 要：
It was tested that predatory quantity of the ladybird,Harmonia axyridis(Pallas) Var.Spectabilis,to the two aphid,Macrosiphum avenae and Rhopalosiphum padi at different densities in the certain space in the laboratory.The results showed that the selective coefficient of the ladybird varied with these two aphid populations.When the two pest population numbers increased synchronously,the ladybird preferred M.avenae. But when only R.padi increased,H.axyridis would obviously like to predate it.On the contrary,when only M. avenae increased,the ladybird would like to predate it.The result of the predatory quantity of the ladybird was similar to the selective coefficient.
