寄主与粮粒对雅脊金小蜂寄生和发育的影响

从三级营养关系出发,研究了不同粮食（小麦和玉米）和寄主（米象和玉米象）对雅脊金小蜂发育和寄生的影响。结果表明：4个三级营养系统中雅脊金小蜂实验种群在4种虫源寄主中均能正常发育,其卵-成虫的发育历期在4种虫源寄主中由短至长依序为：玉米粒-玉米象〈小麦粒-玉米象〈小麦粒-米象〈玉米粒-米象;4种蜂源中雅脊金小蜂对小麦中的米象或玉米象的寄生率、刺死率和总致死率均显著高于对玉米中的米象或玉米象。因此用雅脊金小蜂控制小麦中的米象或玉米象,其效果较之玉米中的米象或玉米象的效果更好。

Influences of Hosts and Grains on Parasitism and Development of Theocolax elegans Westwood

Theocolax elegans Westwood is a predominant parasitoid of major stored grain insect pests, rice weevil,Sitophilus oryzae（L.） and maize weevil,Sitophilus zeamais（Motschulsky）.Interactions among host-grain（wheat or maize）,stored grain insect pests and their natural enemies were investigated in the present paper.The wasp completed development on the fourth-instar host larvae both rice weevil and maize weevil on wheat or maize in free-choice experiment,but development duration was different,the longest being on rice weevil feeding on maize and the shortest,on maize weevil feeding on maize.Mortality caused by parasitism was higher in weevils feeding on wheat than in those feeding on maize.This study suggested that the wasp would confer a higher control against the weevils on wheat than on maize.