In order to get spore suspension, the mycelia were taken from the Petri dish and put into the Armstrong liquid media. After 1-week culture, the spores were collected by filtration then centrifuged. The spore density was kept at 106 spores/ml by diluting centrifuged spores with sterile distilled water prior to the inoculation experiment. The procedure for seedling cultivation was the same as that described above. When the tomato seedlings grew large enough to have seven leaves, they were inoculated with the spore suspension of the pathogen by pin stabbing (Dhingra and Sinclair, 1995, p. 158). The control plants were similarly inoculated with sterile distilled water.