Deltamethrin Resistance in Field Populations of Rhyzopertha dominica (Fabricius) (Coleoptera: Bostrichidae) Collected from Paddy Rice Warehouses in Taiwan
Other Title
臺灣稻穀倉庫中穀蠹 (鞘翅目：長蠹蟲科) 對第滅寧之感受性評估
Journal
台灣農業研究
Journal Volume
74
Journal Issue
1
Start Page
1
End Page
10
ISSN
2790-086X
Date Issued
2025-03-01
Author(s)
Abstract
The lesser grain borer, Rhyzopertha dominica (Fabricius) is one of the most common stored product pests found in the paddy rice warehouses in Taiwan. Both larvae and adults can bite through the husk of paddy rice, causing serious losses. Currently, 0.055% dustable powder of deltamethrin is the only insecticide applied in the paddy rice warehouses to control the lesser grain borer in Taiwan. Deltamethrin has been recommended to control the stored product pests for 21 years since 2002. The long-term use of insecticides may lead to the development of insect resistance. In this study, we collected 21 R. dominica populations from paddy rice warehouses and obtained the deltamethrin resistance ratio of R. dominica with the rice-mixing method. The highest resistance ratios to del-tamethrin were found in Wufeng, Hemei, Lukang, Minxiong, Liujiao, Houbi, Wandan, Dongshan, Yilan and Sanxing with the resistance ratios exceeding 117.65-fold. Results showed that R. dominica populations have developed high resistance to deltamethrin after a decade-long use of deltamethrin in Taiwan. To solve effectively control the lesser grain borer, it is necessary to find the alternative insec-ticides for controlling the stored product pests in paddy rice warehouses in Taiwan.
穀蠹 (Rhyzopertha dominica (Fabricius)) 為我國公糧稻穀倉庫中最常見的主要害蟲，其幼蟲與成蟲均能咬破稻穀的穎殼，直接侵入稻穀內部取食，造成嚴重危害。目前公糧稻穀儲藏期間主要使用 0.055% 第滅寧粉劑與稻穀均勻混拌來防治穀蠹。然而自 2002 年推薦使用第滅寧至今，長期使用單一作用機制的藥劑可能已導致積穀害蟲產生抗藥性。本研究從臺灣各地稻穀倉庫採集 21 個穀蠹族群，並透過稻穀混拌法取得榖蠹對第滅寧的抗藥性數據，結果顯示霧峰、鹿港、民雄、六腳、後壁、萬丹、冬山、宜蘭及三星地區的抗藥性最為嚴重，抗性比最高超過 117.65 倍，證實經過多年連續使用，確實已經導致榖蠹發展出第滅寧抗藥性。為解決因抗藥性引起的第滅寧殺蟲效果下降問題，未來將逐步篩選替代藥劑，以增加我國公糧稻穀倉庫混拌藥劑的種類，減少因抗藥性造成之積穀害蟲防治效果不彰。
Subjects
Paddy rice warehouse
Rhyzopertha dominica
Deltamethrin
Lethal concentration 50
Resistance ratio
稻穀倉
穀蠹
第滅寧
半致死濃度
抗性比
Publisher
農業部農業試驗所
Type
journal article
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