Abstract
Corynebacterium sepedonicum (syn. Clavibacter michiganense subsp. sepedonicum) was recovered from within the roots of symptomless sugar beet plants that had grown in the field and from roots grown in soil that was artificially infested with C. sepedonicum. The sugar beet strains were identical to potato strains based on biochemical, pathological, and serological tests. Sugar beet strains caused ring rot symptoms of interveinal chlorosis and wilt of potato, eggplant, and tomato. Sugar beet was established as a symptomless natural host for C. sepedonicum.

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