DNA relatedness among the pathovars of Pseudomonas syringae and description of Pseudomonas tremae sp. nov. and Pseudomonas cannabina sp. nov. (ex Sutic and Dowson 1959).
A total of 48 pathovars of P. syringae and 8 related species were studied by DNA-DNA hybridization (S1 nuclease method) and ribotyping. The existence of 9 discrete genomospecies was indicated. The pathovars and species in each genomospecies are listed. Two new species, P. tremae sp. nov. and P. cannabina sp. nov., are described.