Relative sensitivity to the fungicides benomyl and iprodione of Botrytis elliptica f rom Taiwan and the Northwestern U.S.A.
Other Title
台灣和美國西北部的百合灰黴病菌對殺菌劑免賴得與依 普同的相對感受性
Journal
植物病理學會刊
Journal Volume
10
Journal Issue
2
Pages
93-95
Date Issued
2001-06
Author(s)
Abstract
Isolates of B o t rytis elliptica were tested for growth on potato dextrose agar as well as potato dextrose agar amended with discriminatory concentrations of benomyl (1μg a.i. ml- 1) or iprodione (10μg a.i. ml- 1) . Fourteen of these isolates originated from Washington or Oregon State in the USA, and the remaining 48
isolates were from Taiwan. Relative fungicide sensitivity was assessed by dividing the extent of growth after 96 h on amended media over the growth on unamended medium. There was no significant difference in growth rates on unamended PDA between isolates from Taiwan compared to those from the U.S.A.; however isolates from Taiwan showed higher relative growth, 4-fold or 2-fold greater, respectively, on benomyl or iprodione-amended media than isolates from the U.S.A. More research is needed to determine
whether these Taiwan isolates showing less sensitivity to benomyl or iprodione also exhibit resistance in the field to normal fungicide application rates.
由Botrytis elliptica引起的百合灰黴病，是國際上百合栽培區的重要病害之一，在缺乏優良抗病品種的情況下，防治本病一直仰賴藥劑的使用。在密集的藥劑噴拖下，北美及歐洲地區已陸續出現抗藥性菌株的報導。本研究之目的即在於測試與比較臺灣及美國的灰黴病菌菌株對免賴得(屬benzimidazole藥劑)和依普同(屬dicarboximide藥劑)兩種藥劑的感受性。由臺灣中部地區罹灰黴病的百合植株上分離得48株灰黴病菌菌株，並由美國華盛頓川百合罹病株上分得14個菌株，分別培養在PDA及含藥劑的PDA平板上，測試各菌株之菌絲生長情況。結果發現分離自臺灣的菌株與美國的菌株間，菌絲生長速無明顯差異性；然而，比較分離自兩國之菌株在含藥劑的培養基上生長的情形，發現臺灣灰黴病菌菌株的菌絲生長勢優於美國的菌株。顯示臺灣的灰黴病菌菌株對免賴得及依普同的忍受性高於美國的菌株。大部份的美國菌株在1μg ml-1的免賴得或10μg ml-1的依普同濃度下，菌絲生長完全受抑制；然而臺灣的菌株在1μg ml-1的免賴得濃度下菌絲生長不受抑制，而在10μg ml-1，的依普同濃度下，48個菌株之中只有11個菌株的菌絲生長完全受抑制。本篇是首次發現臺灣的百合灰黴病菌菌株對benzimidazole和dicarboximide兩類藥劑的感受性降低的報告。
Subjects
benomyl
Botrytis elliptica
fungicide sensitivity
iprodione
Publisher
中華民國植物病理學會
Type
journal article
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