- classification : Eubacteria, Gammaproteobacteria, Xanthomonadales, Xanthomonadaceae
- English name: Bacterial leaf spot and head rot

 

Many bacteria are isolated from the necrotic lesions seen on salads. Of these, only Xanthomonas campestris pv. vitians , with a polar flagellum, is considered to be pathogenic on these plants, along with Pseudomonas cichorii .

This bacterium , known to be more prevalent in hot regions, is now widespread. It has been reported in many countries, on lettuce and chicory, in particular in Australia, South Africa, USA, Canada, Venezuela, Japan and in several European countries such as Germany, Italy. .

In France , it seems to be on the rise in recent years and is causing very significant damage. Entire plots are sometimes invaded in a few days and almost all spoiled salads cannot be marketed.

Two new names are attributed to this bacterium: Xanthomonas axonopodis pv. vitians and Xanthomonas hortorum pv. vitians .