In order to clarify the predation and biological control potential of Lemnia saucia and Cheilomenes sexmaculata against Rhopalosiphum maidis.The predation functional response,searching efficiency,intraspecific interference and self-density interference of adult ladybirds L.saucia and C.sexmaculata to adult R.maidis were assessed separately under indoor conditions.The predatory functional response of L.saucia and C.sexmaculata adults to R.maidis adults fitted with Holling Ⅱ model,with daily maximum predation numbers reaching 256.4 and 277.8,respectively.The searching efficiency of L.saucia and C.sexmaculata to R.maidis showed a negative relationship to the prey density.With the increase of predator density interference un-der a constant ladybird-to-aphid ratio,average predation rates decreased,while sharing compe-tition intensities increased.In addition,the predation of ladybird was influenced by their self-density,the competitive parameters of L.saucia and C.sexmaculata were 0.814 5 and 0.831 9,respectively.L.saucia and C.sexmaculata have strong biological control potential against R.maidis,providing a theoretical basis for the sustainable management of R.maidis.
关键词
黄斑盘瓢虫/六斑月瓢虫/玉米蚜/捕食作用/生物防治
Key words
Lemnia saucia/Cheilomenes sexmaculata/Rhopalosiphum maidis/predation/bio-logical control
维普
万方数据