Susceptibility of Deltamethrin-Resistant Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae) to Alternative Insecticides
Other Title
第滅寧抗藥性穀蠹（鞘翅目：長蠹蟲科）對替代殺蟲劑之感受性評估
Journal
台灣農業研究
Journal Volume
75
Journal Issue
2
Start Page
249
End Page
263
ISSN
2790-086X
Date Issued
2026-06-06
Author(s)
Abstract
The lesser grain borer, Rhyzopertha dominica (Fabricius), is a major pest of stored paddy rice in Taiwan. Deltamethrin has been the primary insecticide recommended for rice-mixing applications in warehouses since 2002. However, its long-term use has led to widespread resistance in field populations, particularly in central and southern Taiwan. To identify potential alternative insecticides, this study evaluated the susceptibility of 20 field-collected R. dominica populations with varying levels of deltamethrin resistance to six insecticides representing four different modes of action: 1B organophosphates- malathion and phoxim; 3A pyrethroids- permethrin and phenothrin; 5 spinosyns- spinosad; and 6 avermectins & milbemycins- abamectin. Laboratory bioassays using the rice-mixing method revealed that most populations remained susceptible to malathion, phoxim, spinosad, and abamectin compared to the laboratory population. In contrast, all tested populations showed high resistance to phenothrin. Although some populations showed only moderate resistance to permethrin compared to the laboratory population, they demonstrated extremely high LC50 values exceeding 10,000 μg mL-1, indicating limited field utility. These findings suggest that malathion, phoxim, spinosad, and abamectin show potential as alternative insecticides for managing deltamethrin-resistant R. dominica in paddy rice warehouses. Field trials are required to validate their efficacy, determine appropriate operational dosages under practical conditions to support future insecticide registration, as well as to establish a science-based insecticide rotation strategy in paddy rice warehouses in Taiwan.
穀蠹 (Rhyzopertha dominica (Fabricius)) 為臺灣稻穀倉庫中的重要害蟲。自 2002 年起，第滅寧即為倉庫中稻穀混拌處理所推薦使用的主要殺蟲劑，惟長期使用已導致田間族群普遍產生抗性，特別是在臺灣中部與南部地區。為尋找具潛力之替代藥劑，本研究針對 20 個具不同第滅寧抗藥性程度之穀蠹田間族群，評估其對 4 種不同作用機制之 6 種殺蟲劑的感受性，包括 1B 有機磷類：馬拉松與巴賽松；3A 除蟲菊類：百滅寧與撲滅芬；5 賜諾司類：賜諾殺；以及 6 阿維菌素類 & 米爾貝黴素：阿巴汀。透過稻穀混拌法進行之實驗室生物檢定結果顯示，相較於實驗室敏感品系，大多數族群對馬拉松、巴賽松、賜諾殺及阿巴汀保持感受性。相較之下，所有受測族群皆對撲滅芬呈現高度抗性；另雖部分族群相對於實驗室品系僅呈現中度百滅寧抗性，但其半致死濃度值均超過 10,000 μg mL-1，顯示其田間應用價值極為有限。綜合結果顯示，馬拉松、巴賽松、賜諾殺及阿巴汀具有作為第滅寧抗性穀蠹防治替代藥劑之潛力。後續仍需透過田間試驗驗證其實際防治效果，並確立於實際操作條件下的適宜施用劑量，以支持未來登記使用與建立倉庫稻穀殺蟲劑輪用之科學化管理策略。
Subjects
Rhyzopertha dominica
Alternative insecticides
Lethal concentration 50%
Resistance ratio
Level of insecticide resistance
穀蠹
替代殺蟲劑
半致死濃度
抗性比
殺蟲劑抗性程度
Publisher
農業部農業試驗所
Type
journal article
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