The results of study indicated that the primary inocula of rice Phyllosticta leaf blight (Phyllosticta oryzicola Hara) were associated with the diseased rice leaves, rice seeds, and field grasses. In diseased-area, the diseased leaves in the field were the main primary inocula. The percentage of diseased seeds was generally 0. 5~2. 5%, and the infected part was almost only in or on glumes. The grasses such as Echinochloa crusgalli var. mitts, E. crus-galli var. zelayensis, Paspaium distichum, Setaria viridi...
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