The Erwiniaceae are a family of Gram-negative bacteria which includes a number of plant pathogens and insect endosymbionts.

[1] Source:[1] These bacteria are catalase-positive, oxidase-negative, and do not produce indole or hydrogen disulfide.

[1] These CSIs provide a reliable molecular method of identification and differentiation of Erwiniaceae species from other families in the order Enterobacterales and other bacteria.

The original assignment of species into the family Enterobacteriaceae was largely based on 16S rRNA genome sequence analyses, which is known to have low discriminatory power and the results of which changes depends on the algorithm and organism information used.

Despite this, the analyses still exhibited polyphyletic branching, indicating the presence of distinct subgroups within the family.