Species representing the genus (, the gall-, wilt-, and dry-necrosis-producing phytopathogens) were examined for relatedness to each other, to pectobacteria, and to other members of the family The technique employed to show relatedness was deoxyribonucleic acid (DNA) hybridization and hydroxyapatite chromatography. The results indicate that all erwiniae are significantly related to and to other enterobacteria. DNA relatedness reveals six species of , and , and show close intrageneric relatedness, whereas the other species exhibit as much relatedness to members of other genera as to the other species. The data support the two-genus concept of and


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