The present paper deals with two bacterial diseases, both causing brown or black spots in cruciferous plants. They attack leaves, stalks, peduncles, capsules and cause a great damage to rapes and chinese cabbages. No distinct differences of symptoms are found between the two. They are determined only by the causal organisms. One of the causal organisms usually isolated from radish, turnip, r ape, cabbage, cauliflower, Mizu-na, Usei-sai and Karasi-na is identical with Bact. maculicola in every respect of its characters but the other from chinese cabbage, Taka-na and Mikawazima-na is slight different and corresponds to Bact. maculicola var. japonicum previously reported. Both organisms are alive in seeds and soil, which play a role for the primary infection of the diseases.