Migration of invasive Spodoptera frugiperda (Lepidoptera: Noctuidae) across the Bohai Sea in northern China

doi:10.1016/S2095-3119(20)63281-6

摘要/Abstract

摘要：

草地贪夜蛾是原生于美洲热带和亚热带地区的重要农业害虫，迁飞是其区域性成灾的重要原因。研究明确草地贪夜蛾种群迁飞动态和季节性转移危害规律，对发展预测预报和综合治理技术有重要意义。渤海海峡是中国华北地区昆虫迁入东北的必经之地，我们利用高空测报灯取样、稳定性同位素和轨迹分析等技术与方法，监测分析了草地贪夜蛾的跨海迁飞活动。研究表明草地贪夜蛾秋季时存在频繁的跨海迁飞活动，迁移种群均为“玉米型”，95.07%的迁飞个体来自于玉米等C4植物，轨迹分析显示该虫2019年已经迁入东北地区。本研究为研发华北和东北玉米主产区草地贪夜蛾的种群监测预警技术提供了理论依据。

Abstract: The fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith), is an important agricultural pest with a strong migratory ability. While the species is native to the Americas, it has recently invaded China, ravaging crops in many provinces (autonomous regions, municipalities). Its long-distance migration, which is critical to understand for pest management programs, has been well studied in its native region. In other regions however, the moth’s migration patterns have not yet been characterized. Here, the migratory behavior of FAW populations in China was studied on an isolated island located in the center of the Bohai Strait from spring to autumn 2019, the year in which FAW first reached this region, by using searchlight trapping, stable carbon isotopes and trajectory simulation. The main results were summarized as follows: (i) The number of FAW moths caught by searchlight trapping provided direct evidence that the species migrated across the Bohai Sea. (ii) Species identification was confirmed by both morphology and molecular methods, and only the “corn-strain” that preferentially infests maize and sorghum was found in the collections. (iii) Stable carbon isotope measurements showed that up to 95.07% of captured moths displayed the C4 isotope signature, thus providing additional evidence that this species is a migrant as there are no major C4 plants at the trapping site. (iv) Backward trajectory analysis indicated that the pest now threatens to expand its range into the agriculturally important region of Northeast China, and thus authorities in this region should be vigilant to the threat posed by this species. Together, these findings add to our knowledge concerning the occurrence of FAW in northern China, and will help us to develop sustainable and effective monitoring, forecasting, and pest management strategies.

Key words: Spodoptera frugiperda , overseas migration , searchlight trapping , host strains , stable carbon isotopes , migration

. [J]. Journal of Integrative Agriculture, 2021, 20(3): 685-693.

JIA Hui-ru, GUO Jiang-long, WU Qiu-lin, HU Chao-xing, LI Xiao-kang, ZHOU Xian-yong, WU Kong-ming . Migration of invasive Spodoptera frugiperda (Lepidoptera: Noctuidae) across the Bohai Sea in northern China[J]. Journal of Integrative Agriculture, 2021, 20(3): 685-693.

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