Scientia Agricultura Sinica ›› 2022, Vol. 55 ›› Issue (10): 1949-1960.doi: 10.3864/j.issn.0578-1752.2022.10.006

• PLANT PROTECTION • Previous Articles     Next Articles

Migration Pathway of Spodoptera frugiperda in Northwestern China

WU QiuLin1,2(),JIANG YuYing3,LIU Yuan4,LIU Jie3,MA Jing4,HU Gao5,YANG MingJin4,WU KongMing2()   

  1. 1Key Laboratory of Agricultural Meteorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044
    2State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193
    3National Agro-Tech Extension and Service Center, Beijing 100125
    4Agricultural Technology Extension Station of Ningxia Hui Autonomous Region, Yinchuan 750001
    5College of Plant Protection, Nanjing Agricultural University, Nanjing 210095
  • Received:2021-11-10 Accepted:2021-12-28 Online:2022-05-16 Published:2022-06-02
  • Contact: KongMing WU E-mail:wuqiulin89@126.com;kmwu@ippcaas.cn

Abstract:

【Background】As a major migratory insect pest putting the whole world on alert, the fall armyworm Spodoptera frugiperda warned by Food and Agriculture Organization of the United Nations (FAO) poses a serious threat to the agriculture production (including maize) of China from the end of 2018. Taking advantages of the long-distance transport of seasonal monsoons and its self-powered migratory capacity, S. frugiperda performs two migration pathways to fly across the eastern and western China separately, which has caused regional dispersal and severe infestation. According to 2-year systematic investigation in China, the west migration route of S. frugiperda ends in Northwestern China, especially in Ningxia and Alxa Left Banner of Inner Mongolia. However, little is known about the source areas of S. frugiperda population invading Northwestern China, and few reports explore the migration route of this devastating pest through the whole western China.【Objective】The objective of this study is to accurately analyze on the key atmospheric factors driving the immigration of S. frugiperda into the Northwestern China, source regions of the first populations to arrive, and Asian monsoon-induced migration pathways of S. frugiperda, which can provide fundamental evidence for the early warning and regional management and control of this invasive pest in China.【Method】Based on the invasion dynamics of S. frugiperda in Ningxia of the Northwestern China and meteorological data, a meso-scale numerical model, insect’s flight trajectory calculating program, and Geographic Information System (GIS) were used to identify the atmospheric transport backgrounds, simulate the succussive 1-3 night migration routes and trace their source regions of S. frugiperda in the Northwestern China.【Result】The southerly summer monsoon from July to September each year was the key factor for the successive and successful immigration of S. frugiperda into Ningxia and other regions of Northwestern China, of which their major source populations of S. frugiperda were located in southeastern Gansu and eastern Sichuan, while some were from western Shaanxi. In addition, southwestern Chongqing, northeastern Yunnan and part of western Shanxi could possibly provide population source of S. frugiperda.【Conclusion】Under the influence of southerly Asian summer monsoons, S. frugiperda can fly towards the north for 1-3 successive nights via its west migration pathway “Yunnan-Sichuan and Chongqing-Shaanxi and Gansu-Ningxia” in China, which originates from Myanmar and ends in Inner Mongolia, China. In particular, the government should be vigilant against the occurrence and damage of this devastating pest in the maize-cropping regions of Northwestern China while the preponderance of early southerly wind is advanced and wind speed gets strong during July to September.

Key words: Spodoptera frugiperda, Northwestern China, migration pathway, summer monsoon, monitoring and early warning

Table 1

First record of S. frugiperda in Ningxia from 2019[32] to 2020"

2019年始见日期
First recorded date in 2019 (m-d)
2019年发生县
(市、区)
Distribution of reported moth in 2019
2019年发生虫态
及数量(头)
Pest status and
number in 2019
2020年成虫始见日期
First recorded date in
2020 (m-d)
2020年发生县
(市、区)
Distribution of reported moth in 2020
2020年发生虫态
及数量(头)
Pest status and
number in 2020
07-31 彭阳县Pengyang 成虫Adult (4) 07-09 原州区Yuanzhou 成虫Adult (5)
08-01 同心县Tongxin 成虫Adult (5) 07-10 同心县Tongxin 成虫Adult (4)
08-02 原州区Yuanzhou 成虫Adult (2) 07-13 海原县Haiyuan 成虫Adult (4)
08-02 西吉县Xiji 成虫Adult (12) 07-16 盐池县Yanchi 成虫Adult (1)
08-03 隆德县Longde 成虫Adult (1) 07-20 红寺堡区Hongsibao 成虫Adult (1)
08-04 泾源县Jingyuan 成虫Adult (5) 07-23 中宁县Zhongning 成虫Adult (1)
08-07 盐池县Yanchi 成虫Adult (1) 07-28 利通区Litong 成虫Adult (1)
08-07 海原县Haiyuan 成虫Adult (1) 08-03 彭阳县Pengyang 成虫Adult (1)
08-08 红寺堡区Hongsibao 成虫Adult (7) 08-07 西吉县Xiji 成虫Adult (2)
08-09 中宁县Zhongning 成虫Adult (1) 08-20 泾源县Jingyuan 成虫Adult (3)
08-11 利通区Litong 成虫Adult (1)
08-14 青铜峡市Qingtongxia 成虫Adult (1)
08-16 灵武市Lingwu 成虫Adult (3)
08-19 平罗县Pingluo 成虫Adult (2)
08-20 贺兰县Helan 成虫Adult (1)
09-05 沙坡头区Shapotou 成虫Adult (5)

Fig. 1

Distribution and possibility of source areas of initially invasive S. frugiperda in Ningxia in 2019 (A-C) and 2020 (D-F)"

Fig. 2

Average night-time wind and air temperature at 850 hPa from July to September in 2019 and 2020"

Fig. 3

Daily nocturnal downwind directions at 850 hPa, responsible for the initial immigrations of S. frugiperda at monitoring sites in Ningxia"

Fig. 4

Monthly wind anomalies at 850 hPa in July 2019 (A) and 2020 (B)"

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