Bacterial soft rot of colored calla lily a very serious disese in Taiwan. The disease incidence may reach high to 50%in the field. In the study, a total of 26 strains of soft rot Erwinia were isolated from rotted tissues collected from colcred calla lily grown fields in Houli, Wujih and Cholan. Based on the physiological and biochemical tests, 19 strains were identified as Erwinia carotovora subsp. carotovora, while the other 7 strains were Erwinin chrysanthemi with phenotypic characteristics similar to the strains in the subdivision Ⅱ and biovar 6 according to the Dickey''s and Boccara''s classification systems.
