Identification materials were arranged randomly with three replications of 10 plants each. Resistant cultivar Zhongnong No. 13 and susceptible cultivar Jinza No. 4 were used as con- trols. All seedings were inoculated, at the stage of fully open first true leaf, with a single strain of Cladosporium cucumer- inum. Both sides of the leaves of the seedlings were sprayed uniformly using a hand-pumped sprayer to the point of leaf runoff. Inoculation concentration was 2 · 106 spores/mL. After inoculation, plants were kept in the dark at 100% relative humidity (RH) for 24 h, followed by 7 to 10 d at 60%/85% RH (day/night) at temperatures of 20 to 23 °C