Refuge strategies for managing resistance to Bt maize in fall armyworm in smallholder farming systems: a case study from China

IF 4.3 1区 农林科学 Q1 ENTOMOLOGY
Guodong Kang, Xianming Yang, Haowen Zhang, Yanfang Huang, Yishu Sun, Gemei Liang, Kongming Wu
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Abstract

The invasion of fall armyworm Spodoptera frugiperda poses a significant threat to the maize production of smallholder farmers in Asia and Africa. Bt maize is an effective measure for controlling this pest, but resistance management strategies tailored to the smallholder farming systems in the old world remain poorly understood. Surveys conducted from 2021 to 2022 in key infestation regions of Yunnan and Guangxi, China, revealed that an average administrative village includes 633 households, each cultivating 0.22 ha of maize per season, with 95.68% of fields smaller than 0.33 ha. Laboratory and field studies indicated that the high dispersal ability of fall armyworm larvae facilitated frequent larval movement between Bt and non-Bt maize within seed mixtures and structured refuges in smallholder farming systems. Resistance evolution models showed that establishing structured refuges covering 10–20% of households at the village level significantly slowed resistance development. This study proposes a village-based structured refuge strategy, proportionally allocated according to household distribution. The strategy is simple and feasible for smallholder farming systems in developing countries, offering a novel approach for managing resistance to Bt maize in fall armyworms.

小农农业系统中管理秋粘虫对Bt玉米抗性的避难所策略:来自中国的案例研究
秋粘虫(Spodoptera frugiperda)的入侵严重威胁着亚洲和非洲小农的玉米生产。Bt玉米是控制这种害虫的有效措施,但是为旧世界的小农农业系统量身定制的抗性管理策略仍然知之甚少。2021 - 2022年在云南和广西重点侵病区开展的调查显示,平均每个行政村有633户,每户每季玉米种植面积为0.22公顷,其中95.68%的农田面积小于0.33公顷。室内和田间研究表明,秋粘虫幼虫的高传播能力促进了小农户种植系统中Bt玉米和非Bt玉米混合种子和结构避难所之间的频繁迁移。抗性进化模型显示,在村一级建立覆盖10-20%家庭的结构性避难所显著减缓了抗性的发展。本研究提出了一种基于村庄的结构化避难策略,根据家庭分布按比例分配。该策略简单可行,适用于发展中国家的小农农业系统,为管理秋粘虫对Bt玉米的抗性提供了一种新方法。
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来源期刊
Journal of Pest Science
Journal of Pest Science 生物-昆虫学
CiteScore
10.40
自引率
8.30%
发文量
114
审稿时长
6-12 weeks
期刊介绍: Journal of Pest Science publishes high-quality papers on all aspects of pest science in agriculture, horticulture (including viticulture), forestry, urban pests, and stored products research, including health and safety issues. Journal of Pest Science reports on advances in control of pests and animal vectors of diseases, the biology, ethology and ecology of pests and their antagonists, and the use of other beneficial organisms in pest control. The journal covers all noxious or damaging groups of animals, including arthropods, nematodes, molluscs, and vertebrates. Journal of Pest Science devotes special attention to emerging and innovative pest control strategies, including the side effects of such approaches on non-target organisms, for example natural enemies and pollinators, and the implementation of these strategies in integrated pest management. Journal of Pest Science also publishes papers on the management of agro- and forest ecosystems where this is relevant to pest control. Papers on important methodological developments relevant for pest control will be considered as well.
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