Xanthomonas hortorum

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

pv. hederae, common ivy and possibly other Araliaceae
pv. taraxaci, Pelargonium peltatum
pv. carotae, wild carrot
pv. pelargonii, Kazakh dandelion
pv. vitians, bacterial leafspot and headrot of lettuce, using the neopathotype of LMG 938
pv. cynarae, formerly Xanthomonas cynarae, pathogenic on artichoke
pv. gardneri, formerly Xanthomonas gardneri and briefly X. cynarae pv. gardneri, bacterial leafspot of peppers and tomatoes

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.