Abstract
Twelve seed collections of tobaccos growing wild in the Okinawa district were evaluated for certain morphological characters and disease resistance. CG, nsiderable variations in morphological features and disease reactions were noted among these collections. Plant height ranged from 95.3cm to 171.9cm, the number of leaves from 9.8 to 17.3 and leaf shape index from O.471 to O.764. There were two types in the shape of leaf-base, sessile and petioled, and three types in flower color, white, pink and white/pink variegation. Most of the collectibns were highly susceptible to bacterial wilt, but moderately or slightly resistant to black root rot and powdery mildew. There were large differences in their reactions to black shank; sorne of them were highly or moderately resistant and the others were highly susceptible. The collections which were rated resistant were considered to be useful as a source of black shank resistance.
