Strains labelled Enterobacter cancerogenus (Erwinia cancerogena) and strains labelled Enterobacter taylorae were found to constitute a single DNA-relatedness group (S1 nuclease hybridization method). Furthermore, no phenotypic test among the conventional and nutritional tests performed could differentiate Enterobacter cancerogenus from Enterobacter taylorae. Therefore, Enterobacter cancerogenus (Urosević, 1966) Dickey and Zumoff, 1968, is a senior subjective synonym for Enterobacter taylorae Farmer et al., 1985.