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- Title
Sensitivity of Rhizoctonia solani causing rice sheath blight to fluxapyroxad in China.
- Authors
Chen, Yu; Yao, Jian; Yang, Xue; Zhang, Ai-Fang; Gao, Tong-Chun
- Abstract
Fluxapyroxad,3-(difluoromethyl)-1-methyl-N-(3',4',5'-trifluorobiphenyl-2-yl) pyrazole-4-carboxamide (CHFNO, 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 EC value of 0.054 ± 0.014 μg ml. However, EC 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) EC 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.
- Subjects
RHIZOCTONIA solani; AGONOMYCETACEAE; RHIZOCTONIA diseases; RICE planting rites; CORTICIUM sasakii
- Publication
European Journal of Plant Pathology, 2014, Vol 140, Issue 3, p419
- ISSN
0929-1873
- Publication type
Article
- DOI
10.1007/s10658-014-0477-7