Resistance Profiles of Botrytis cinerea to Fluxapyroxad from Strawberry Fields in Shanghai, China
文献类型： 外文期刊
作者： Gao, Ping 1 ; Zeng, Rong 1 ; Gao, Shigang 1 ; Xu, Lihui 1 ; Song, Zhiwei 1 ; Dai, Fuming 1 ;
作者机构： 1.Shanghai Acad Agr Sci, Inst Ecoenvironm & Plant Protect, Shanghai Key Lab Protect Hort Technol, Shanghai 201403, Peoples R China
关键词： Botrytis cinerea; fluxapyroxad; resistance; SDHI
期刊名称：PLANT DISEASE （ 影响因子：4.5； 五年影响因子：5.0 ）
ISSN： 0191-2917
年卷期： 2023 年 107 卷 9 期
页码：
收录情况： SCI
摘要： Fluxapyroxad, a type of succinate dehydrogenase inhibitor fungicide, has been used to control the growth of gray mold on strawberry for more than 5 years in China. Selection for resistance to the causal agent Botrytis cinerea became a threat to the efficacy of fluxapyroxad. In total, 160 B. cinerea isolates collected from Shanghai during 2020 and 2021 were tested for their resistance to fluxapyroxad using mycelial growth inhibition. The results indicated that the curve of baseline sensitivity was unimodal, with an approximately normal distribution and a mean effective concentration of the fungicide that inhibited growth by 50% (EC50) of 0.18 +/- 0.01 mg/ml. In total, 27.78 and 48.57% of isolateswere resistant to fluxapyroxad in 2020 and 2021, respectively, where the lowest EC50 value of mycelial growth inhibition was 0.03 mg/ml and the highest value was 51.3 mg/ml. Resistance mechanism analysis showed that the succinate dehydrogenase subunit B (SdhB) N230I mutation could lead to resistance and P225F mutation could lead to higher resistance. These data suggest that the resistance frequency of B. cinerea isolates to fluxapyroxad increased in 2021 compared with 2020, which requires appropriate fungicide rotation strategies to be implemented in order to control gray mold on strawberry in the future.
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