Pseudomonas viridiflava (Pv) isolates collected from cereals, citrus, stone fruits, cucumber, mongo, soil and weeds during 1999-2000 in Fars Province and in Minab were compared based on phenotypic characteristics as well as pathogenicity. From a total of 950 fluorescent isolates, 49 were negative in oxidase, levan production and arginine dihydrolase but were positive in hypersensitive reaction on tobacco, pelargonium or both and were able to produce soft rot on potato tuber slices. Also 11 isolates were negative in producing soft rot on potato tuber slices or utilization of sucrose. Based on complementary biochemical and physiological tests, these 60 isolates were identified as P. viridiflava. Three types of colonies were observed among these isolates. Based on LOPAT (Levan production, Oxidase, Potato soft rot, Arginine dihydrolyse, and Tobacco hypersensitivity) tests, the isolates were divided into four groups.
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