Xanthomonas hortorum

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Xanthomonas hortorum symptoms on peony (click on image to enlarge it)
Author(s): Elizabeth Bush, Virginia Polytechnic Institute and State University
Source: IPM Images

Xanthomonas hortorum Vauterin et al. 1995

This bacterium is widely distributed and is related to Xanthomonas campestris. It also infects a large variety of plants, causing blight, leaf spot, or necrotic streaks. A number of pathovars have been described and some of these have been regarded as separate species. However, this has not been accepted by all authors. Economically, the most important pathovar is probably Xanthomonas hortorum pv. pelargonii (see the separate page), other pathovars include for example:

Xanthomonas hortorum pv. carotae - infecting carrots
Xanthomonas hortorum pv. hederae - see Xanthomonas hederae (infecting ivy)
Xanthomonas hortorum pv. vitians - infecting lettuce