Baseline sensitivity and efficacy of thifluzamide in Rhizoctonia solani

文献类型： 外文期刊

第一作者： Chen, Y.

作者： Chen, Y.;Zhang, A. -F.;Wang, W. -X.;Zhang, Y.;Gao, T. -C.

作者机构：

关键词： baseline sensitivity;boscalid;jinggangmycin;Rhizoctonia solani;SDHI fungicides

期刊名称：ANNALS OF APPLIED BIOLOGY （ 影响因子：2.75； 五年影响因子：2.942 ）

ISSN： 0003-4746

年卷期： 2012 年 161 卷 3 期

页码：

收录情况： SCI

摘要： Thifluzamide is a SDHI (succinate dehydrogenase inhibitor) fungicide, which interferes with succinate ubiquinone reductase in the mitochondrial electron transport chain of fungi. Presently, jinggangmycin is the major fungicide extensively used for the control of rice sheath blight caused by Rhizoctonia solani and resistance to jinggangmycin was first reported to occur in China. A total of 128 isolates of R. solani from Anhui Province of China were characterised for the baseline sensitivity to thifluzamide. The isolates were very sensitive to thifluzamide and the baseline sensitivity curve was unimodal with an average EC50 value of 0.058 +/- 0.012 mu g mL-1. However, EC50 values of boscalid (another SDHI fungicide) for inhibition of mycelial growth of 22 arbitrarily selected R. solani isolates ranged from 1.89 to 2.68 mu g mL-1. Thifluzamide applied at 110 mu g mL-1 exhibited excellent protective and curative activity against rice sheath blight and provided 81.191.0% protective or curative control efficacy. In field trials in 2010 and 2011, control efficacies of thifluzamide at 82 g.a.i ha-1 15 and 30 days after second application were 84.2% and 86.7%, respectively, suggesting excellent activity against sheath blight. There was a statistically significant difference in the efficacy between thifluzamide and boscalid or jinggangmycin. These results suggested that thifluzamide should be a good alternative fungicide to jinggangmycin for the control of rice sheath blight.

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