The mycelia and conidia of Phyllosticta oryzicola Hara could be used as inocula. The rice leaves could be infected by means of wound inoculations,and in which the clipping method is the simplest and most practical. But the unwounded inoculations were not successful. Also, the experiment showed that the rice leaves at the stages of seedling and tillering were resistant while those at the stages of booting, flowering and milk were susceptible. Ac cording to the results of the clipping inoculation at the booting-flowering stage of rice in the field, of 85 cultivars or hybrid combinations, 26 combinations of indica hybrid rice were almost susceptible or highly susceptible. There were significant differences in the resistance among 50 cultivars of medium indica rice,in which most cultivars mainly cultivated in Jiangsu were moderately susceptible or moderately resistant. 8 cultivars of japonica or glutinous rice were moderately resistant or resistant.
