The extensive use of succinate dehydrogenase inhibitors (SDHIs) and quinone outside inhibitors (QoIs) has led to the development of resistance in , which causes corynespora leaf spot (CLS) in cucumber. In this study, the sensitivity and the resistance phenotypes to SDHIs and QoIs were monitored, and the fitness of carrying & mutations was measured. The average 50% effective suppressive concentration (EC) values of to boscalid from 2019 to 2021 ranged from 6.65 to 24.16 μg/mL, while the average EC values of to trifloxystrobin from 2007 to 2021 ranged from 105.11 to 462.02 μg/mL. Ten fungicide resistance phenotypes and 19 resistance genotypes were found. The D-D95E&Cytb-G143A and B-H278L&Cytb-G143A mutants presented increased fitness, while the B-H278Y&Cytb-G143A mutant showed significant fitness costs, and the other mutants presented no or slight fitness costs. These findings provide a basis for the formulation of resistance management strategies of CLS.
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