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Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (8): 80-84.doi: 10.11924/j.issn.1000-6850.casb18100030

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Antifungal Activity Against Rhizoctonia solani: Mixtures of Phenolic Monoterpenes and Difenoconazole or Thifluzamide

Wang Kaibo1, Wu Wenwei1, Wang Qun1, Yin Mei1, Zhang Xingfu2, Yang Congdang3, Fu Zhaocong2, Li Qiongxian2, Pu Jun4, Huang Jimei4, He Chengxing1()   

  1. 1 Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Sciences, Kunming 650201
    2 Huize County Agricultural and Technology Promotion Center, Huize Yunnan 654200
    3 Institute of Food Crop, Yunnan Academy of Agricultural Sciences, Kunming 650201
    4 Qujing City Academy of Agricultural Sciences, Qujing Yunnan 655000
  • Received:2018-10-11 Revised:2018-12-01 Online:2020-03-15 Published:2020-03-10
  • Contact: Chengxing He E-mail:hechengxing69@163.com

Abstract:

The aim is to explore the control effect of the mixtures of phenolic monoterpenes and fungicides against Rhizoctonia solani and screen new fungicides to control corn sheath blight and rice sheath blight. In this study, thymol and carvacrol were mixed with difenoconazole and thifluzamide respectively, and the in vitro antifungal activity of the mixtures against R. solani was determined by mycelium growth rate method. Meanwhile, the synergistic effects of the mixture of phenolic monoterpenes with fungicides were evaluated according to Sun-Yunpei’s method. The results showed that there was synergism between phenolic monoterpenes and thifluzamide in ratios of 1:5, 1:4, 2:3, 3:2, 4:1 and 5:1. The carvacrol and thifluzamide mixture in the ratio of 4:1 exhibited the highest antifungal activity among all of the mixtures, and the EC50 value and CTC value was 0.928 mg/L and 1397.39, respectively. Similarly, the carvacrol and difenoconazole mixtures in the ratio of 3:2, 4:1 and 5:1, as well as thymol and difenoconazole mixtures in the ratio of 2:3, 4:1 and 5:1, exhibited significant synergistic effect. Thymol and carvacrol could significantly enhance the antifungal activity of difenoconazole or thifluzamide. The carvacrol and thifluzamide mixture in the ratio of 4:1 exhibited high antifungal activity against R. solani, and this mixture could be potentially used to control corn sheath blight and rice sheath blight. When mixed with some fungicides at a certain ratio, the two natural phenolic monoterpenes could significantly enhance their antifungal activity, which has a high research value to the development and screening of fungicide.

Key words: carvacrol, thymol, synergistic effect, Rhizoctonia solani

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