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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2022年59 No.1

The predatory capacity of Arma custos for Spodoptera litura and Helicoverpa armigera larvae
Author of the article:SUN Jing-Jing; WANG Meng-Qing; ZHANG Li-Sheng; ZHAO Ping; CAI Wan-Zhi; LI Hu
Author's Workplace: Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China; Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; Institute of Geography and Oceanography, Nanning Normal University, Nanning 530001, China
Key Words:Arma custos; Spodoptera litura;Helicoverpa armigera;predation preference;biological control
Abstract:
[Objectives]  To determine the predatory ability and prey preferences of Arma custos with respect to larvae of the tobacco cutworm, Spodoptera litura, and the cotton bollworm, Helicoverpa armigera[Methods]  The daily predation rate and prey preferences of 3rd, 4th and 5th-instar nymphs and adults of A. custos with respect to 3rd-instar larvae of S. litura and H. armigera were studied using both non-choice and choice tests under laboratory conditions. [Results]  The daily predation rate of 3rd, 4th and 5th-instar nymphs, and adult, A. custos on S. litura were 3.90, 5.20, 8.70 and 7.40 larvae/day, respectively, and on H. armigera were 3.30, 8.20, 14.30 and 11.10 larvae/day, respectively. The daily predation rate of all developmental stages of A. custos, with the exception of 3rd-instar nymph stage, was significantly higher on H. armigera than that on S. litura. Choice tests showed that, under the same prey density, A. custos had a significant preference for S. litura over H. armigera. The daily predation rate of A. custos on S. litura larvae was significantly higher than that on H. armigera larvae at almost all prey density combinations, except when the S. litura density was much lower. [Conclusion]  These results show that, although A. custos had a higher daily predation rate on 3rd-instar larvae of H. armigera than those of S. litura, when 3rd-instar larvae S. litura and H. armigera larvae were both present, A. custos preferentially preyed on S. litura.
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