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Effect of nucleopolyhedrovirus infection of Spodoptera litura larvae on host discrimination by Microplitis pallidipes

文献类型: 外文期刊

作者: Jiang, Jie-Xian 1 ; Bao, Yang-Bing 1 ; Ji, Xiang-Yun 1 ; Wan, Nian-Feng 1 ;

作者机构: 1.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai Key Lab Protected Hort Technol, Shanghai, Peoples R China

关键词: host discrimination;Microplitis pallidipes Szepligeti;nucleopolyhedrovirus;parasitism rate;Spodoptera litura Fabricius;virus concentration

期刊名称:BIOCONTROL SCIENCE AND TECHNOLOGY ( 影响因子:1.665; 五年影响因子:1.616 )

ISSN: 0958-3157

年卷期: 2014 年 24 卷 5 期

页码:

收录情况: SCI

摘要: The behaviour and oviposition of solitary endoparasitoid Microplitis pallidipes Szepligeti (Hymenoptera: Braconidae) were monitored to investigate the ability of the parasitoids to distinguish between nucleopolyhedrovirus (NPV)-infected and noninfected Spodoptera litura Fabricius (Lepidoptera: Noctuidae) larvae. The results indicated that the parasitoid searching time and the time until the first parasitoid attack on infected larvae were greater than those recorded on noninfected larvae; the number of infected larvae attacked by parasitoids, the percent of first attacks and parasitism rate in infected larvae were lower than those on noninfected larvae; and these differences were all significant 3 to 5 days postexposure of the larvae to a dose of 1.6 x 10(8) occlusion bodies (OB) ml(-1) and significant 4 and 5 days postexposure of the larvae to a dose of 1.6 x 10(7) OBml(-1). The lowest dosage (1.6 x 10(6) OBml(-1)) had no significant effect on the above index values. In a field cage experiment, we found that the percentage of infected larvae parasitized by M. pallidipes gradually decreased as the time after NPV inoculation (1.6 x 10(8) OBml(-1)) increased, and that M. pallidipes significantly preferred to oviposit in healthy larvae from day 3 to day 5 after virus inoculation. Our research concluded that this parasitoid's ability to discriminate between healthy and infected hosts increased as virus concentration increased and as the time between exposure of hosts to virus and subsequent exposure to parasitoids increased.

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