1Anhui Province Key Laboratory of Integrated Pest Management on Crops，College of Plant Protection，Anhui Agricultural University，Hefei 230036，Anhui，China；2College of Horticulture，Anhui Agricultural University，Hefei 230036，Anhui，China
Abstract：This experiment collected infected plants from 4 Sclerotinia sclerotiorum infected plots in main cabbage production areas of Anhui Province in 2020-2021，and isolated and purified the bacterial isolates．The pathogenicity of each isolate of 9 cabbage varieties was tested by in vivo inoculation of mycelium disc．At same time，the sensitivities of representative isolates to dimethachlon，carbendazim and boscalid were determined by mycelial growth rate method．The results showed that the pathogenicity of 24 isolates of S. sclerotiorum showed significant differences．The pathogenicity of different isolates was different on the same cabbage variety．There were also obvious differences in pathogenicities of isolates from the same region．But，there was no significant correlation between pathogenicity differentiation of isolates and geographical origin．All tested isolates were higher sensitive to dimethachlon，carbendazim and boscolid．Therein，sensitivity to carbendazim was the highest，EC50 value ranging 0.037 1-0.104 2 μg · mL-1．The EC50 value of dimethachlon and boscolid were 0.055 4-0.137 7 μg · mL-1 and 0.074 4-0.187 0 μg · mL-1，respectively．
