Abstract: The incompatible isolates of Cladosporium cucumernium with heat-resisting and low pathogenisity was obtained by high temperature treatments. It was showed that the low pathogenicity of C. cucumernium is stability. The heat-resistance isolates of C. cucumernium could induce cucumber scab resistance, and the induced resistance ability could inheritance, however there was a lag stage in the induced resistance expression. The induced resistance effect increased with the increase of induced inoculum concentration, and challenge inoculum concentration increased, induced effect reduced.

Key words: cucumber, cucumber scab, Cladosporium cucumernium, heat-resistance, heat treatment, pathogenicity, induction disease-resistance