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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2022年59 No.3

The predatory functional responses of Sycanus croceovittatus preying on Spodoptera frugiperda larvae
Author of the article:CHEN Su-Yi;ZHAO Ping;SHI Ai-Min;SHI Ping-Li;CAI Wan-Zhi;SHI An-Xian; LI Hu
Author's Workplace:Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China; Institute of Geography and Oceanography, Nanning Normal University, Nanning 530001, China; Suzhou Tuidongzhe Biotechnology Co., LTD, Suzhou 215000, China; Station of Plant Protection of Zhaotong City, Zhaotong 657100, China
Key Words:Spodoptera frugiperda; Sycanus croceovittatus; predatory functional response; searching effect; interference effect
Abstract:
[Objectives]  To evaluate the potential of the assassin bug, Sycanus croceovittatus, as a biological control for Spodoptera frugiperda. [Methods] The predatory functional responses of 3rd to 5th-instar nymphs and adults of Sy. croceovittatus preying on 3rd and 4th instar Sp. frugiperda larvae were tested under laboratory conditions. The effect of population density on the predatory behavior of Sy. Croceovittatus was also investigated. [Results]  The predatory functional responses of Sy. croceovittatus age classes fitted the Holling Ⅱ disc equation. According to this model, 3rd to 5th instar nymphs, and female and male adults, of Sy. croceovittatus consumed a daily maximum of 23.267, 18.252, 25.432, 59.559 and 51.894 3rd instar Sp. frugiperda larvae, respectively, and had a predation capacity of 10.321, 19.219, 21.251, 52.877 and 44.390, respectively. Daily maximum consumption of the above age classes was 5.886, 7.570, 8.584, 22.477 and 10.057, respectively, and the predation capacity for 4th instar Sp. frugiperda larvae was 4.861, 7.023, 7.906, 26.410 and 14.402, respectively. Adults females were the most efficient predators. Predation of Sy. croceovittatus on Sp. frugiperda was affected by both prey and predator density. Predation rate was positively correlated with prey density, search duration was negatively correlated with prey density, and interference was positively correlated with predator density. [Conclusion]  In general, nymphs and adults of Sy. croceovittatus could partly control 3rd and 4th instar Sp. frugiperda larvae, but adults were more efficient predators than nymphs.
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