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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2019年56 No.1

Predation of Orius sauteri on Thrips hawaiiensis in the laboratory
Author of the article:FU Bu-Li1** QIU Hai-Yan1 LI Qiang1 SUN Yan-Tang2 ZHOU Shi-Hao2 YANG Shi-You2 LI Shan-Guang1
Author's Workplace:1. The Ministry of Agriculture and Rural Affairs Key Laboratory of Integrated Pest Management of Tropical Crops, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Engineering Research Center of Tropical Crops Pest Biological Control, Haikou 571101, China; 2. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
Key Words:Orius sauteri; Thrips hawaiiensis; biological control; predation
Abstract: [Objectives]  To evaluate the potential of Orius sauteri as a biological control for the thrip Thrips hawaiiensis. [Methods]  The functional response, search efficiency, interference response and prey preferences, of O. sauteri preying on T. hawaiiensis were observed under laboratory conditions. [Results]  Predation of O. sauteri on T. hawaiiensis followed a Holling-type II functional response. The highest predation rates were recorded for 5th-instar nymphs and adults of O. sauteri preying on 2nd-instar nymphs and adults of T. hawaiiensis, which had a'/Th values of 126.64 and 64.30 individuals and 1/Th for 149.25 and 84.75 individuals per day, respectively. Predation rate was positively correlated with prey density but there was a negative relationship between search efficiency and prey density. 5th-instar nymphs and adults of O. sauteri were more effective in prey searching than other developmental stages. Mean predation rate decreased with increasing predator density, which suggests that intraspecific interference adversely affects predation efficiency at high predator densities and that the relationship between predation rate and predator density approximates a Hassell-model equation. A choice-test indicated that O. sauteri has a strong preference for 2nd-instar nymphs of T. hawaiiensis, followed by adults, and a relatively low preference for pupae. [Conclusion]  O. sauteri is an effective predator of T. hawaiiensis. These results provide a theoretical basis for evaluating the potential of O. sauteri as a biological control for T. hawaiiensis.
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