Baseline sensitivity of Rhizoctonia solani to four DMI fungicides

文献类型： 外文期刊

第一作者： Gao, Shigang

作者： Gao, Shigang;Xu, Lihui;Zeng, Rong;Gao, Ping;Song, Zhiwei;Dai, Fuming

作者机构：

关键词： baseline sensitivity; cross-sensitivity; DMI fungicides; Rhizoctonia solani

期刊名称：JOURNAL OF BASIC MICROBIOLOGY （ 影响因子：2.65； 五年影响因子：2.958 ）

ISSN： 0233-111X

年卷期： 2022 年 62 卷 6 期

页码：

收录情况： SCI

摘要： A set of 78 Rhizoctonia solani isolates from Shanghai, China, were examined for their sensitivity in vitro to four demethylase inhibitor (DMI) fungicides, epoxiconazole, difenoconazole, hexaconazole, and tebuconazole, by the mycelial growth rate method. The isolates were very sensitive to the four DMI fungicides. The ranges and means of the EC50 values were 0.004-0.045 and 0.014 +/- 0.007 mu g ml(-1) for epoxiconazole, 0-0.103 and 0.010 +/- 0.016 mu g ml(-1) for difenoconazole, 0.001-0.078 and 0.011 +/- 0.013 mu g ml(-1) for hexaconazole, and 0.001-0.210 and 0.034 +/- 0.035 mu g ml(-1) for tebuconazole, respectively. The frequency distribution of the EC50 values showed a normal curve for epoxiconazole and an approximately unimodal curve for difenoconazole, hexaconazole, and tebuconazole. There was no correlation between the sensitivities of the R. solani population to any two of the four fungicides (r < 0.3). In field trials, in 2015 and 2016, the control efficacies of hexaconzole, epoxiconazole, and tebuconazole were >90.0% at 75 g.a.i. ha(-1), 80.0%-90.0% at 75 g.a.i. ha(-1) and 80.0%-90.0% at 97 g.a.i. ha(-1), respectively; these values are significantly higher (p < 0.05) than those obtained in this study for difenoconazole (65.0%-70.0% at 80 g.a.i. ha(-1)) and jinggangmycin (68.0%-71.0% at 150 g.a.i. ha(-1)). These results show that sensitivity data can be used to monitor and detect any variations in the sensitivity of the R. solani population to these four DMI fungicides, and demonstrate that epoxiconazole, hexaconazole, and tebuconazole are likely to be good alternatives to jinggangmycin for controlling rice sheath blight.

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