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Cotesia ruficrus ( Hymenoptera: Braconidae) Parasitizing Cnaphalocrocis medinalis ( Lepidoptera: Pyralidae): Developmental Interactions and Food Utilization Efficiency of Hosts

文献类型： 外文期刊

作者： Chen, Yuan 1 ; Liu, Xiao-Gai 1 ; Wang, Jia 1 ; Zhao, Jing 1 ; Lu, Zhong-Xian 2 ; Liu, Ying-Hong 1 ;

作者机构： 1.Southwest Univ, Coll Plant Protect, Key Lab Entomol & Pest Control Engn, Chongqing 400716, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou 310021, Zhejiang, Peoples R China

关键词： rice leaf folder;developmental interaction;clutch size;food consumption;biological control

期刊名称：JOURNAL OF ECONOMIC ENTOMOLOGY （ 影响因子：2.381； 五年影响因子：2.568 ）

ISSN：

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收录情况： SCI

摘要： Cotesia ruficrus (Haliday), a gregarious larval endoparasitoid, is an important biological control agent of various pest species. The developmental interactions between the host rice leaf folder,Cnaphalocrocis medinalis (Guen,e), and its koinobiont parasitoid,C. ruficrus, were investigated for the first time under laboratory conditions. The effects of host instar at parasitization on the development time, clutch size, and survival ofC. ruficrus were determined. The results showed that the parasitoids starting parasitism in the fourth-instar larvae had the shortest development duration and highest fecundity. Meanwhile, the growth of the host parasitized byC. ruficrus in various instars was also observed. The results indicated that the growth of the parasitized larvae was significantly inhibited, compared with unparasitized ones, irrespective of the host instar at oviposition. In addition, the effect of parasitism on food consumption and utilization of the fourth-instar larvae was determined, suggesting that the nutritional physiology of the host was affected by parasitism. Wet or dry weight gain, food consumption, and fecal matter were all significantly reduced in the parasitized larvae in contrast with the unparasitized larvae. Parasitization byC. ruficrus could significantly increase the approximate digestibility of the host.

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