Xanthomonas hortorum is a plant pathogen. It includes the following pathovars;

The species was originally defined in 1995 as a grouping of pathovars hederae, taraxaci, carotae, pelargonii from Xanthomonas campestris, and the lettuce-infecting part of X. c. pv. vitians. (X. c. pv. vitians was found to consist of two genetic groups, only one of which causes disease on lettuce.)

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