Abstract: High temperature (40 - 50 ℃) for 1 - 2 hours induced resistance to the scab pathogen , Cladosporium cucumerinum in cucumber plants. The high temperatures of 40 ℃2 hours or 45 ℃1 hour was found to be the optimal
treatment for the induction of resistance. Plants inoculated with C. cucumerinum just at the time of 4 hours after heat shock of high temperature exhibited increased resistance to the fungus. A 24 hours interval from heat shock of high temperature to inoculation allowed for development of maximum resistance. Eighteen cultivars were tested by heat shock of
high temperature , and it was found that different cultivars expressed distinct induction resistance to C. cucumerinum. Some cultivars exhibited induced resistance in the treatments of 40 ℃2 hours and 45 ℃1 hour. Some cultivars exhibited induced resistance in only one of the two treatments , while others had no expression of induced resistance.

Key words: Cucumber, High temperature, Induction, Disease resistance, Cladosporium cucumerinum