Subramanian Parthiban, Choi Jung-Hye, Kim So-Soo, Kim Bo-Eun, Jang Ja-Yeong, Baek Ji-Seon, Lee Theresa
Plant Disease Control Division, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea.
Allium Vegetable Research Center, National Institute of Horticultural and Herbal Science, Rural Development Administration, Muan 58545, Korea.
Plant Pathol J. 2025 Aug;41(4):518-531. doi: 10.5423/PPJ.OA.05.2025.0068. Epub 2025 Aug 1.
Fusarium head blight (FHB) is an important disease reducing yield and quality of wheat and barley. To study changes in fungicide efficacy over time, 161 FHB isolates (F. asiaticum and F. graminearum) were obtained from infected wheat and barley in the Jeolla provinces of the Republic of Korea from 2010-2013 and 2020-2023. Over 10 years, FHB fungi developed resistance to demethylation inhibitors (DMIs), methyl benzimidazole carbamates (MBCs), and phthalimides, with few exceptions. Also, no significant resistance against succinate dehydrogenase inhibitors (SDHI) and quinoneoutside inhibitors (QoI) was observed, but sensitivity to phenylpyrrole (PP) increased. Mycotoxin production by four representative isolates of both species indicated that higher doses of DMI, DMI + DMI, MBC, MBC + DMI, and PP controlled trichothecenes, whereas zearalenone was controlled only by SDHI. QoI, QoI + DMI, and phthalimide did not control mycotoxin production in either species. Despite resistance development, DMI, MBC, and PP can still be used to control FHB and mycotoxins in wheat and barley in Korea with close monitoring of resistance.
镰刀菌穗腐病（FHB）是一种降低小麦和大麦产量及品质的重要病害。为研究杀菌剂药效随时间的变化，于2010 - 2013年以及2020 - 2023年从韩国全罗南道和全罗北道受感染的小麦和大麦中获取了161株FHB分离株（亚洲镰刀菌和禾谷镰刀菌）。在10多年间，除少数例外情况外，FHB真菌对脱甲基抑制剂（DMIs）、甲基苯并咪唑氨基甲酸盐（MBCs）和邻苯二甲酰亚胺产生了抗性。此外，未观察到对琥珀酸脱氢酶抑制剂（SDHIs）和醌外抑制剂（QoIs）有显著抗性，但对苯基吡咯（PP）的敏感性增加。两个物种的4个代表性分离株产生霉菌毒素的情况表明，较高剂量的DMI、DMI + DMI、MBC、MBC + DMI和PP能控制单端孢霉烯族毒素，而玉米赤霉烯酮仅能被SDHI控制。QoI、QoI + DMI和邻苯二甲酰亚胺均无法控制这两个物种中霉菌毒素的产生。尽管出现了抗性，但在韩国对小麦和大麦中的FHB及霉菌毒素进行密切的抗性监测后，DMI、MBC和PP仍可用于防治。
