xanthomonas populi xanthomonas populi xanthomonas populi is a species of bacteria. xanthomonas populi scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: xanthomonadales family: xanthomonadaceae genus: xanthomonas species: x. populi binomial name xanthomonas populi(ridé 1958) van den mooter and swings 1990