河南省禾谷镰孢菌对丙硫菌唑的敏感性

采用菌丝生长速率法，测定了2019—2021年采自河南省11个市的278株禾谷镰孢菌Fusarium graminearum对丙硫菌唑的敏感性。结果表明：供试278株禾谷镰孢菌对丙硫菌唑的敏感频率呈单峰且近似正态分布，各菌株EC₅₀值的范围在0.609～3.868μg/mL之间，最大值为最小值的6.35倍，平均值为(1.741±0.690)μg/mL。此外，不同年份的禾谷镰孢菌对丙硫菌唑的敏感性水平无显著差别。2020年菌株最不敏感，平均EC₅₀值为(1.894±0.652)μg/mL,2021年菌株最敏感，平均EC₅₀值为(1.643±0.701)μg/mL。不同地区的禾谷镰孢菌对丙硫菌唑的敏感性水平有显著性差异。济源市的菌株最不敏感，平均EC₅₀值为(2.175±0.632)μg/mL；开封市的菌株最敏感，平均EC₅₀值为(1.137±0.419)μg/mL；焦作市菌株间敏感性差异最大，最大值为最小值的6.21倍，平均EC₅₀值为(2.073±0.68...

Sensitivity of Fusarium graminearum to prothioconazole in Henan Province

The sensitivity of Fusarium graminearum to prothioconazole was determined with 278 strains collected from 11 cities in Henan Province from 2019 to 2021 using the method of mycelial growth rate in vitro. The results showed that the sensitivity frequency of 278 F. graminearum strains to prothioconazole was a unimodal curve and presented an approximately normal distribution. The EC₅₀ values of the strains ranged from 0.609 to 3.868 μg/mL, with the maximum value being 6.35 times the minimum value. The mean EC₅₀ was (1.741 ± 0.690) μg/mL. In addition, the sensitivity of F. graminearum to propiconazole in different years had no significant difference. For different years, the strains collected in 2020 were the least sensitive with an average EC₅₀ value of (1.894 ± 0.652) μg/mL, while the strains collected in 2021 were the most sensitive with an average EC₅₀ value of (1.643 ± 0.701) μg/mL. The sensitivity of F. graminearum to prothioconazole had significant differences in different regions. The strains in Jiyuan were the least sensitive with an average EC₅₀ value of (2.175 ± 0.632) μg/mL, while those in Kaifeng were the most sensitive with an average EC₅₀ value of (1.137 ± 0.419) μg/mL. The F. graminearum strains from Jiaozuo were the most varied in sensitivity (EC₅₀(Max.)/EC₅₀ (Min.) = 6.21) with an average EC₅₀ value of (2.073 ± 0.681) μg/mL, which was higher than the average of Henan Province. The strains from Xinxiang have the smallest differences in sensitivity (EC₅₀ (Max.)/EC₅₀ (Min.) = 1.75) with an average EC₅₀ value of (1.211 ± 0.349) μg/mL, which was lower than the average in Henan Province. This study provides a theoretical basis for the sensitivity of F. graminearum to prothioconazole in the future through three-year sensitivity monitoring.