A bacterial disease characterized by the development of rectangular lesions on the leaves of konjac ( Koch.) is described. The size of the lesions increased rapidly under humid conditions, resulting in leaf blight. Leaves with severe blight drooped and finally decayed. The disease was identified from the symptoms as bacterial leaf blight on the basis of the descriptions made by Uyeda in 1910. The causal agent was, however, different from (Uyeda) Burkholder in many respects and was found to be a new subspecies of based on the results of a direct comparison of pathological and biochemical properties. The name subsp. subsp. nov. is proposed for the new subspecies, and strain K2 (= ATCC 33996 = PDDCC 7733) is designated the type strain.


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