Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (13): 131-135.doi: 10.11924/j.issn.1000-6850.casb19010112

Special Issue: 水稻 农业生态

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Rhizoctonia solani to Hexaconazole: Sensitivity and Resistance Monitoring

Liu Huifang1, Liu Shijiang2,3, Ding Yi2,3, Zhao Qijun2,3, Li Rongyu2,3,4(), Yang Fan2   

  1. 1 Institute of Tea Research in Guizhou, Guiyang 550006
    2 Institute of Crop Protection, Guizhou University, Guiyang 550025
    3 College of Agriculture, Guizhou University, Guiyang 550025
    4 Provincial Key Laboratory for Agricultural Pest Management in Mountainous Region, Guiyang 550025
  • Received:2019-01-22 Revised:2019-04-10 Online:2020-05-05 Published:2020-04-16
  • Contact: Rongyu Li E-mail:lirongyu0328@126.com

Abstract:

In order to evaluate the resistance risk of Rhizoctonia solani to hexaconazole the sensitivity of 101 R. solani strains to hexaconazole using mycelium growth rate method, which isolated from 7 rice areas of Guizhou, Hubei, Hunan and Henan Provinces, and the baseline sensitivity of R. solani to this fungicide was also established. The results showed that the EC50 of hexaconazole to R. solani in different rice areas was 1.0751 to 2.9228 mg/L, with a mean of 1.8081 mg/L, and the sensitivity differences strains were 2.72 times. The frequnecy of sensitivity was in approximately normal distribution(W=0.980,P=0.157>0.05), and the mean EC50 values could be used as the baseline sensitivity of R. solani to hexaconazole, and therefore the mean EC50 values was used as the baseline sensitivity of R. solani to hexaconazole, and the resistance monitoring during 2016-2018 of R. solani showed that the R. solani strain was still sensitive to hexaconazole. The results of this study provide references for field medication.

Key words: Rhizoctonia solani, hexaconazole, baseline sensitivity, resistance monitoring

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