Activity of A Novel Succinate Dehydrogenase Inhibitor Fungicide Pydiflumetofen Against Fusarium fujikuroi causing Rice Bakanae Disease

文献类型： 外文期刊

第一作者： Bai, Yang

作者： Bai, Yang;Tan, Gen-Jia;Chen, Yu;Gu, Chun-Yan;Pan, Rui;Zang, Hao-Yu;Yang, Xue;Abid, Muhammad;Tan, Gen-Jia;Chen, Yu;Tan, Gen-Jia;Chen, Yu

作者机构：

关键词： fungi; field crops; cereals and grains; disease management

期刊名称：PLANT DISEASE （ 影响因子：4.614； 五年影响因子：5.33 ）

ISSN： 0191-2917

年卷期： 2021 年 105 卷 10 期

页码：

收录情况： SCI

摘要： New fungicides are tools to manage fungal diseases and overcome emerging resistance in fungal pathogens. In this study, a total of 121 Fusarium fujikuroi isolates were collected from various geographical regions of China and their sensitivity to a novel succinate dehydrogenase inhibitor (SDHI) fungicide 'pydiflumetofen' was evaluated. The 50% effective concentration (EC50) value of pydiflumetofen for mycelial growth suppression ranged from 0.0101 to 0.1012 mu g/ml and for conidial germination inhibition ranged from 0.0051 to 0.1082 mu g/ml. Pydiflumetofen-treated hyphae showed contortion and increased branching, cell membrane permeability, and glycerol content significantly. The result of electron microscope transmission indicated that pydiflumetofen damaged the mycelial cell wall and the cell membrane, and almost broke up the cells, which increased the intracellular plasma leakage. There was no cross-resistance between pydiflumetofen and the widely used fungicides such as carbendazim, prochloraz, and phenamacril. Pydiflumetofen was found safe to seeds and rice seedlings of four rice cultivars, used up to 400 mu g/ml. Seed treatment significantly decreased the rate of diseased plants in the greenhouse as well as in field trials in 2017 and 2018. Pydiflumetofen showed superb results against the rice bakanae disease (RBD), when used at 10 or 20 g a.i./100 kg of treated seeds, providing over 90% control efficacy (the maximum control efficacy was up to 97%), which was significantly higher than that of 25% phenamacril (SC) at 10 g or carbendazim at 100 g. Pydiflumetofen is highly effective against F. fujikuroi growth and sporulation as well as RBD in the field.

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