- classification : Eubacteria, Gammaproteobacteria, Pseudomonadales, Pseudomonadaceae
- English name: Marginal leaf spot

Pseudomonas marginalis pv. marginalis , bacillus Gram -, is present in many countries of Europe, in India, in South America, in the USA, in Japan, in New Zealand, in Australia ... Its damage on lettuce is often not very severe. This bacterium is reported on other vegetable species such as cabbage, cucumber, onion, potato, green beans, peas ... It has been isolated from lettuce, chicory leaves and endive .