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| Two-way predation between immature stages of the hoverfly Eupeodes corollae and the invasive fall armyworm (Spodoptera frugiperda J. E. Smith) |
LI Hui1, 2, JIANG Shan-shan2, ZHANG Hao-wen2, GENG Ting3, Kris A. G. WYCKHUYS2, WU Kong-ming2 |
1 Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, P.R.China
2 State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China
3 Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China |
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摘要
草地贪夜蛾于2018年入侵亚洲后，迅速扩散，成为影响玉米生产安全的重大害虫。农药的使用减缓了草地贪夜蛾的为害，但由于长期使用的局限性，可替代或辅助农药的生物防治技术目前依然是国内外关注的焦点。大灰食蚜蝇（双翅目：食蚜蝇科）是玉米等多种作物田内的优势天敌昆虫，可取食草地贪夜蛾幼虫。本研究在室内模拟田间环境，研究了大灰食蚜蝇Eupeodes corollae幼虫对草地贪夜蛾卵和不同龄期幼虫的捕食能力。结果表明，2龄、3龄大灰食蚜蝇幼虫对1龄和2龄草地贪夜蛾的幼虫具有捕食作用，理论日最大捕食量分别为43.48头和83.33头。当草地贪夜蛾幼虫发育至3龄后，显现出对低龄大灰食蚜蝇幼虫的捕食行为，5龄和6龄草地贪夜蛾幼虫对1龄、2龄、3龄大灰食蚜蝇的理论日最大捕食量分别为16.39-19.23头、6.02-19.61头和6.76-8.26头，捕食作用符合功能反应Ⅲ。表明草地贪夜蛾幼虫与大灰食蚜蝇存在捕食互作关系，其入侵后将影响大灰食蚜蝇等天敌昆虫的种群动态。综上，本试验为鳞翅目害虫与天敌昆虫的互作关系研究提供了新的思路，对综合评价草地贪夜蛾与天敌昆虫的物种关系和发展生物防治技术具有重要意义。
Abstract Since its 2018 invasion of eastern Asia, the fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) has become a key pest in local maize production. Though pesticides have been widely used to mitigate the initial S. frugiperda attack, biological control is receiving ample attention as a desirable, environmentally-sound alternative to chemical control. Hoverflies (Diptera: Syrphidae) are abundant natural enemies in Chinese maize fields and have been observed to consume S. frugiperda larvae. In this study, we use laboratory assays to study the two-way interaction between immature stages of S. frugiperda and the endemic syrphid Eupeodes corollae. To mimic natural conditions, assays were performed in the presence of fresh maize leaves. Those 2nd or 3rd instar larvae of E. corollae preyed on 1st and 2nd instar S. frugiperda larvae with a Holling type III response, consuming a respective theoretical maximum of 43.48 and 83.33 larvae over a 24-h period. Conversely, once S. frugiperda larvae reached 3rd instar, they exhibited aggressive behavior and equally preyed on syrphid larvae with a Holling type III response. Those 5th and 6th instar larvae of S. frugiperda consumed a respective 16.39–19.23, 6.02–19.61 and 6.76–8.26 of 1st, 2nd and 3rd instar E. corollae larvae per day. Though our results await field-level validation, S. frugiperda agonistic (i.e., defensive) and consumptive behavior towards resident natural enemies such as E. corollae possibly degrades biotic resistance and raises its invasion potential. Our findings shine new light on the interaction between lepidopteran herbivores and their natural enemies, and can help advance the development of conservation biological control and other integrated pest management (IPM) strategies against S. frugiperda in China and abroad.
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Received: 23 March 2020
Accepted:
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| Fund: This work was supported by the earmarked fund for China Agriculture Research System (CARS-15-19). |
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Corresponding Authors:
Correspondence WU Kong-ming, E-mail: wukongming@caas.cn
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| About author: LI Hui, E-mail: lihuilh521@163.com; |
Cite this article:
LI Hui, JIANG Shan-shan, ZHANG Hao-wen, GENG Ting, Kris A. G. WYCKHUYS, WU Kong-ming .
2021.
Two-way predation between immature stages of the hoverfly Eupeodes corollae and the invasive fall armyworm (Spodoptera frugiperda J. E. Smith). Journal of Integrative Agriculture, 20(3): 829-839.
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