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Mating and host density affect host feeding and parasitism in two species of whitefly parasitoids

文献类型： 外文期刊

作者： Zang, Lian-Sheng 2 ; Liu, Tong-Xian 1 ; Zhang, Fan 4 ; Shi, Shu-Sen 2 ; Wan, Fang-Hao 3 ;

作者机构： 1.NW A&F Univ, Key Lab Appl Entomol, Yangling 712100, Shaanxi, Peoples R China

2.Jilin Agr Univ, Inst Biol Control, Changchun, Peoples R China

3.Chinese Acad Agr Sci, Key Lab Biol Plant Dis & Insect Pests, Inst Plant Protect, Beijing, Peoples R China

4.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing, Peoples R China

关键词： Bemisia tabaci;biological control;Encarsia sophia;Eretmocerus melanoscutus

期刊名称：INSECT SCIENCE （ 影响因子：3.262； 五年影响因子：3.206 ）

ISSN： 1672-9609

年卷期： 2011 年 18 卷 1 期

页码：

收录情况： SCI

摘要： The parasitoids in the genera of Encarsia and Eretmocerus (Hymenoptera: Aphelinidae) are important biological control agents of whiteflies, and some of them not only parasitize hosts but also kill them with strong host-feeding capacity. Two whitefly parasitoid species, Encarsia sophia and Eretmocerus melanoscutus were examined to determine if mating and host density affected their host feeding and parasitism. The whitefly host, Bemisia tabaci, was presented to these two wasp species in densities of 10, 20, 30, 40, 50 and 60 third-instar nymphs per clip cage. Mated whitefly parasitoid females fed on more hosts than unmated females under a range of host densities (under all six host densities for En. sophia; under the densities of 40 nymphs or more for Er. melanoscutus). Meanwhile, mated females parasitized more whitefly nymphs than unmated females under all host densities for both species. With increase of host density, mated or unmated Er. melanoscutus females killed more hosts by host feeding and parasitism. Mated En. sophia females killed more hosts by host feeding with increase of host density, whereas unmated females did not parasitze whitefly nymphs at all. Our results suggest that only mated female parasitoids with host-feeding behavior should be released in crop systems to increase their bio-control efficiency.

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