Baseline sensitivity of Blumeria graminis f.sp.tritici to pydiflumetofen in China
Pydiflumetofen is a succinate dehydrogenase inhibitor(SDHI),which was registered for controlling Fusarium head blight in wheat in 2019 in China.To clarify the potential control effect on wheat powdery mildew and monitor resistance of Blumeria graminis f.sp.tritici(Bgt)to pydiflumetofen,the sensitivities of 110 Bgt isolates collected from nine provinces such as Henan,Shandong and so on in 2019 and before 2000,were determined by detached leaf segments method.The EC50 values of pydiflumetofen against 88 Bgt isolates collected in 2019 ranged from 0.010 2 to 0.766 8 μg/mL,and the mean EC50 value was(0.224 3±0.179 6)μg/mL.The EC50 values of pydiflumetofen against 22 Bgt isolates collected before 2000 ranged from 0.052 1 to 0.882 4 μg/mL,and the mean EC50 value was(0.356 3±0.279 6)μg/mL,while there was no significant difference on EC50 values between 2019 and before 2000.The EC50 values of 110 Bgt isolates to pydiflumetofen ranged from 0.010 2 to 0.882 4 μg/mL,and the mean EC50 value was(0.250 7±0.210 3)μg/mL.The frequency distribution of EC50 values of 110 Bgt isolates to pydiflumetofen showed a unimodal curve and could be regarded as the baseline sensitivity.The above results provides data support for controlling wheat powdery mildew and monitoring the pydiflumetofen resistance of Bgt.
State Key Laboratory for Biology of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing 100193,China
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