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Issue:ISSN 2095-1353
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Your Position :Home->Past Journals Catalog->2016年53 No.6

Predation of Paratrioza sinica Yang & Li by adult Hippodamia variegata (Goeze)
Author of the article:WU Peng-Xiang1, 2** OUYANG Hao-Yong1, 2 XU Jing1 ZHANG Rong3HE Jia3 ZHANG Run-Zhi1***
Author's Workplace:1. Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Institute of Plant Protection, Ningxia Academy of Agro-Forestry Sciences, Yinchuan 750002, China
Key Words: Hippodamia variegata, Paratrioza sinica Yang & Li, predation
Abstract:[Objectives]  To study predation by Hippodamia variegata (Goeze) adults on Poratrioza sinica Yang & Li. [Methods]  The functional predation response, mutual interference, influence of prey density, and the prey preferences of H. variegata with respect to P. sinica were investigated under laboratory conditions and the effects of predation on P. sinica populations were studied in the field. [Results]  The functional response of H. variegata adults to P. sinica approximated a Holling Ⅱ model. Daily maximum numbers of P. sinica eggs, 1st to 5th instar nymphs, and adults, preyed on by H. variegata adults were 80.4, 410.0, 350.8 and 102.5, respectively. The density of P. sinica in field enclosures decreased by 85.4% over the 30 day life-span of adult H. variegate. The search efficiency of H. variegata for P. sinica adults was 0.8252 and the processing time of H. variegata for P. sinica eggs was 0.002283, both of which were higher than for other P. sinica life stages. Prey density was more important than mutual interference on the predation efficiency of H. variegata. At a predator: prey density of 1∶100, H. variegata preferred P. sinica adults, but preferred P. sinica nymphs at a predator: prey density of 1∶300. [Conclusion]  H. variegata has the potential to be an effective biological control agent for P. sinica.
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