Insecticide Susceptibility Dynamics and Control Failure Risk of Spodoptera frugiperda (Lepidoptera: Noctuidae) to Insecticides in Taiwan
Other Title
臺灣秋行軍蟲(鱗翅目：夜蛾科)對殺蟲劑感受性變化與防治失效風險
Journal
台灣農業研究
Journal Volume
75
Journal Issue
2
Start Page
265
End Page
280
ISSN
2790-086X
Date Issued
2026-06-07
Author(s)
Abstract
Fall armyworm (FAW), Spodoptera frugiperda, invaded Taiwan in 2019 and rapidly became a major pest of maize and sorghum. This study evaluated the susceptibility of field populations from different regions and years to various chemical insecticides- including organophosphates, pyrethroids, neonicotinoids, spinosyns, diamides, and insect growth regulators- and two Bacillus thuringiensis (Bt) formulations. At the time of invasion, the FAW population exhibited significant differences in susceptibility to the tested insecticides. Based on control failure likelihood (CFL) values at recommended concentrations, spinetoram, flubendiamide, novaluron, and chlorantraniliprole posed a negligible risk of control failure, whereas Bt subsp. aizawai (Bta) NB-200 and flucythrinate presented a high risk. Comparisons of FAW populations collected from mainland Taiwan in 2019 and 2023 showed significantly lower LC50 values for chlorantraniliprole and novaluron, but a significantly higher LC50 for Bta ABTS-1857, in the 2023 populations. In contrast, susceptibility to etofenprox, spinetoram, and Bta NB-200 did not change significantly. After 38 laboratory generations without insecticide exposure, the laboratory-maintained YY progeny showed a marked recovery of susceptibility to flubendiamide and chlorantraniliprole, with LC50 values decreasing by 9.76- and 201.91-fold, respectively. These findings highlight the importance of insecticide selection pressure in FAW resistance dynamics and are consistent with integrated pest management approaches that involve insecticide rotation and the temporary withdrawal of compounds showing elevated resistance.
秋行軍蟲 (Spodoptera frugiperda) 於 2019 年入侵臺灣，迅速成為玉米與高粱的重要害蟲。本研究旨在評估臺灣不同地區及時間的秋行軍蟲田間族群對多種化學殺蟲劑 (包括有機磷類、除蟲菊精類、新尼古丁類、賜諾司類、二醯胺類殺蟲劑及昆蟲生長調節劑) 及 2 種蘇力菌 (Bacillus thuringiensis) 製劑的敏感性。在入侵初期，秋行軍蟲族群對各測試農藥之感受性差異顯著，依據推薦濃度之防治失效可能性分析 (control failure likelihood; CFL) 顯示，賜諾特、氟大滅、諾伐隆及剋安勃的防治失效風險可忽略，而蘇力菌 NB-200 與護賽寧則具有高防治失效風險。比較 2019 與 2023 年臺灣本島採集的秋行軍蟲族群，結果顯示兩年度族群之感受性模式存在差異，2023 年族群對剋安勃與諾伐隆之半數致死濃度 (LC50) 顯著較低，但對蘇力菌 ABTS-1857的之 LC50 顯著較高。至於依芬寧、賜諾特及蘇力菌 NB-200 族群間感受性差異不顯著。田間族群 YY 品系在經過 38 代未接觸殺蟲劑的實驗室內飼養後，其對氟大滅與剋安勃的感受性顯著回復，LC50 分別下降 9.76 倍與 201.91 倍，顯示殺蟲劑感受性隨未接受選汰壓力時間大幅回升。綜合而言，本研究結果突顯選汰壓力在秋行軍蟲抗藥性消長動態中的關鍵作用，支持以藥劑輪用及策略性暫停使用高風險藥劑為核心之綜合害蟲管理(integrated pest management; IPM) 策略。
Subjects
Fall armyworm
Insecticide resistance
Diamide insecticides
Control failure likelihood
Integrated pest management
秋行軍蟲
殺蟲劑抗藥性
二醯胺類殺蟲劑
防治失效可能性
害蟲綜合管理
Publisher
農業部農業試驗所
Type
journal article
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