Peculiarities of lisogenic induction of bacteriocins in thymine-dependent mutants of Erwinia carotovora subsp. carotovora have been studied. It was shown for the first time that availability of carotovoricins of two (and above) types characterized the defect polylysogeny of strains of different geographic origin. Use of various methods of induction of Thy--mutants or inducing agents of different nature leads to a selective accumulation of carotovoricins of certain types in the cell lysates. Results of the conducted investigations create preconditions for estimating an ecologic part of the defect lysogeny and bacteriocynogenicity for the important phytopathogenic bacterium E. carotovora.