Searchlight trapping reveals seasonal cross-ocean migration of fall armyworm over the South China Sea

doi:10.1016/S2095-3119(20)63588-2

摘要/Abstract

摘要：

草地贪夜蛾自美洲入侵后，已成为亚洲的重大迁飞性农业害虫。在海南省三沙市永兴岛设置的高空测报灯监测表明，草地贪夜蛾的迁飞活动始于2019年4月11日，4-9月是迁飞常发期。对捕获个体的分子鉴定和碳稳定同位素分析显示，迁飞个体主要为幼期取食C4植物的玉米型。轨迹分析表明草地贪夜蛾主要在越南等东南亚国家与中国东南部地区进行跨海迁飞活动，这种远距离迁移行为将促进草地贪夜蛾中国种群与东南亚种群的基因交流。研究结果对指导东亚和东南亚国家草地贪夜蛾的区域性监测预警与综合防治工作具有重要的科学价值和意义。

Abstract:

The fall armyworm (FAW), Spodoptera frugiperda, is a migratory noctuid pest that has recently invaded eastern Asia. From 2017 up till 2020, searchlight trapping was used to assess the extent of FAW migration across the South China Sea. Molecular and morphology-based identification confirmed that FAW made its first appearance on Yongxing Island on 11 April 2019, with most trapped individuals belonging to the S. frugiperda “corn-strain”. Carbon isotope analysis further showed that FAW moths originated from C4 host plants, while trajectory analyses revealed that migratory S. frugiperda adults are able to cross the South China Sea and enter mainland China. This long-distance migration process plausibly results in frequent genetic mixing between domestic FAW populations and those of neighboring Southeast Asian countries. Overall, this work provides unique insights into FAW migration across eastern Asia and ultimately can help advance pest forecasting, risk assessment and area-wide pest management.

Key words: Spodoptera frugiperda , host strain , isotope , trajectory analysis , cross-ocean migration , invasion biology

. [J]. Journal of Integrative Agriculture, 2021, 20(3): 673-684.

ZHOU Xian-yong, WU Qiu-lin, JIA Hui-ru, WU Kong-ming. Searchlight trapping reveals seasonal cross-ocean migration of fall armyworm over the South China Sea[J]. Journal of Integrative Agriculture, 2021, 20(3): 673-684.

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