Journal of Integrative Agriculture ›› 2021, Vol. 20 ›› Issue (3): 764-771.DOI: 10.1016/S2095-3119(20)63288-9

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  • 收稿日期:2020-03-02 出版日期:2021-03-01 发布日期:2021-02-18

Cold hardiness of the invasive fall armyworm, Spodoptera frugiperda in China

ZHANG Dan-dan, ZHAO Sheng-yuan, WU Qiu-lin, LI Yu-yan, WU Kong-ming   

  1. 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
  • Received:2020-03-02 Online:2021-03-01 Published:2021-02-18
  • Contact: Correspondence WU Kong-ming, Tel: +86-10-82105551, E-mail: wukongming@caas.cn
  • About author:ZHANG Dan-dan, Tel: +86-10-62816306, E-mail: wua134152 @163.com;
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31727901 and 31901873) and the National Key Research and Development Program of China (2019YFD0300101).

摘要:

草地贪夜蛾是原生于美洲大陆热带和亚热带地区的重要农业害虫,入侵我国后迅速扩散蔓延至二十多个省份,对农业生产造成了严重威胁。草地贪夜蛾的抗寒性反映了其对冬季温度的适应程度,直接决定地理分布区域。本研究对草地贪夜蛾的测定表明,不同发育阶段的过冷却点从低到高的顺序依次为:成虫(-15.05°C)<蛹(-13.25°C)<预蛹(-10.50°C)<幼虫(-9.03°C)。对卵和1-4龄幼虫低温生存时间的分析显示,卵在不同低温下的致死时间(lethal time,LT)显著短于幼虫,而大龄幼虫则显著长于低龄幼虫。在2°C、7°C和13°C下,4龄幼虫的LT99值分别为18.59 d、58.72 d和66.28 d,而卵的LT99值仅分别为5.33 d、9.28 d和12.97 d。研究结果为明确草地贪夜蛾在我国的越冬区域和发展区域性监测预警与控制技术提供了科学依据。


Abstract:

Fall armyworm, Spodoptera frugiperda (J. E. Smith, 1797), a crop pest native to tropical and subtropical regions of America, has invaded and spread into most regions in China, posing a severe threat to China’s agriculture.  The cold hardiness directly determines its geographic distribution through adapting to winter temperatures of different regions.  Here, we measured supercooling points and lethal time (LT) at low temperatures of S. frugiperda.  The supercooling points for developmental stages in increasing order were: adults (–15.05°C)<pupae (–13.25°C)<prepupae (–10.50°C)<larvae (–9.03°C).  Among eggs and 1st to 4th instar larvae, the 99% lethal time (LT99) was the highest for 4th instar larvae, with 99% of larvae dying after 18.59 d at 2°C, 58.72 d at 7°C, and 66.28 d at 13°C.  LT99 was the lowest for eggs with LT99 of 5.33 d at 2°C, 9.28 d at 7°C, and 12.97 d at 13°C.  This study provides an understanding of overwintering regions of S. frugiperda in China, which will be helpful for population forecasting and management.

Key words: Spodoptera frugiperda ,  supercooling point ,  overwinter ,  China