Details of the protocols for i noculum preparation and inoculation are given in Chen et al. (2008). Briefly, 35-day-old seedlings were spray-inoculated with zoospore/sporangia suspensions of
5× 104 /mL of selected pathogen isolates. Inoculated seedlings were incubated in a growth room at 100% relative humidity and 20 ± 2C◦ without light for the first 24 h. Afterwards, growth room conditions were maintained at 60–95% RH, a daily 14-h light period (70 µE m2 s-1 ) and 20 ± 2◦
C. Each plant was visually scored 10 days after inoculation according to the following scale, where 0 = no symptoms; 1 = 1–5% leaf area affected, small lesions