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Sensitivity of Rhizoctonia solani causing rice sheath blight to fluxapyroxad in China

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Abstract

Fluxapyroxad,3-(difluoromethyl)-1-methyl-N-(3’,4’,5’-trifluorobiphenyl-2-yl) pyrazole-4-carboxamide (C18H12F5N3O, Fig. 1), is a SDHI fungicide, which is a new active ingredient that interferes with succinate ubiquinone reductase in the electron transport chain of fungi. Between 2008 and 2010, a total of 128 isolates of Rhizoctonia solani from Anhui Province of China were characterized for the baseline sensitivity to fluxapyroxad. The isolates collected between 2008 and 2010 all showed similar sensitivity to fluxapyroxad. Baseline sensitivity was distributed as unimodal curves with an average EC50 value of 0.054 ± 0.014 μg ml−1. However, EC50 values of boscalid for inhibition of mycelial growth of R. solani isolates ranged from 1.89 to 2.68 μg/ml and the average (±SE) EC50 value was 2.212 ± 0.228 μg/ml, indicating that the R. solani isolates were less sensitive to boscalid than that of fluxapyroxad. Fluxapyroxad exhibited excellent protective and curative activity against rice sheath blight and provided 82.6–94.2 % protective or curative control efficacy. In field trials, control efficacy of fluxapyroxad at 100 g a.i/ha 15 days and 30 day after second application was 83.4–88.0 %, suggesting excellent activity against sheath blight. Control efficacy of boscalid at a dosage of 600 g a.i/ha 15 days and 30 day after second application was about 51.7–57.0 %. There was a significant difference in the efficacy between fluxapyroxad and boscalid or jinggangmycin. These results suggested that fluxapyroxad is a good alternative fungicide to jinggangmycin for the control of rice sheath blight.

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Acknowledgments

We gratefully thank Dr. Gerd Stammler (BASF SE, 67117 Limburgerhof, Germany) for his critical revision and suggestions for this manuscript. This research was supported by: (i) the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period (No. 2013BAD07B08, 2011BAD16B06 & 2012BAD04B09), (ii) Special Fund for Agro-Scientific Research in the Public Interest from the Ministry of Agriculture, China (201303023), (iii) National Natural Science Foundation of China (31201550 & 31272073); (iv) 2014 Science and Technological Fund of Anhui Province for Outstanding Youth (1408085J02), (v) Special Fund for Quality Inspection Research in the Public Interest from the General Administration of Quality supervision, Inspection, and Quarantine of the People’s Republic of China (201410073), (vi) the Research Program from the General Administration of Quality supervision, Inspection, and Quarantine of the People’s Republic of China (2012IK267, 2010IK249 & 2014IK014); (vii) Anhui Provincial Scientific and Technological Project (1301032138); (viii) Innovation Team of Anhui Academy of Agricultural Sciences (12C1105, 13C1113 & 14C1111), (ix) Rice Industrial System of Anhui Province and (x) Seed Project of Anhui Academy of Agricultural Sciences (13D1107).

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Authors and Affiliations

  1. Institute of Plant Protection and Aro-Products Safety, Anhui Academy of Agricultural Sciences, Hefei, 230031, China

    Yu Chen, Xue Yang, Ai-Fang Zhang & Tong-Chun Gao

  2. Anhui Entry-Exit Inspention and Quarantine Bureau, Hefei, 230022, China

    Jian Yao

  3. Scientific Observing and Experimental Station of Crop Pests in Hefei, Ministry of Agriculture, Hefei, China

    Yu Chen, Xue Yang, Ai-Fang Zhang & Tong-Chun Gao

  4. Laboratory of Quality & Safety Risk Assessment for Agro-Products (Hefei), Ministry of Agriculture, Hefei, China

    Yu Chen, Xue Yang, Ai-Fang Zhang & Tong-Chun Gao

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  1. Yu Chen
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  2. Jian Yao
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  3. Xue Yang
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Correspondence to Yu Chen, Jian Yao or Tong-Chun Gao.

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Chen, Y., Yao, J., Yang, X. et al. Sensitivity of Rhizoctonia solani causing rice sheath blight to fluxapyroxad in China. Eur J Plant Pathol 140, 419–428 (2014). https://doi.org/10.1007/s10658-014-0477-7

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