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Interspecific competition between Fopius vandenboschi and Diachasmimorpha longicaudata in Bactrocera dorsalis larvae

Lü Zeng-yin1,YANG Jian-quan1,CHEN Jia-hua1,HUANG Ju-chang1,JI Qing-e1,DU Ying-gang2(1.Beneficial Insect Laboraory,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;2.Weifang Science and Technology Vocational College,Weifang,Shandong 262700, China)  
Interspecific competition between Fopius vandenboschi(Fullaway) and Diachasmimorpha longicaudata(Shmead) were studied in the laboratory.When Bactrocera dorsalis(Hendel) larvae were exposed to both parasitoids concurrently,parasitism rates of host by F.vandenboschi or by D.longicaudata were not significantly different from those when the host larvae were exposed to one parasitoid of the two species at a time;the joint parasitism rate by the two parasitoids was significantly higher than those by D.longicaudata alone,but not significant higher than those by F.vandenboschi.Both parasitoids could lay eggs into host larvae previously parasitized by the other species.When host larvae were parasitized first by D.longicaudata and then exposed to F.vandenboschi with intervals of 0,24,48 h,the number of eggs or larvae of F.vandenboschi in the host larvae body were reduced constantly,while the number of F.vandenboschi were not influence.When host larvae were parasitized first by F.vandenboschi,and then exposed to D.longicaudata after 24 or 48 h,the proportion of D.longicaudata larvae or eggs in the host larvae body were reduced constantly.
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