Pseudomonas helianthi

 'Pseudomonas helianthi'  is a Gram-negative plant pathogenic bacterium that infects a variety of plants. It was once considered a pathovar of Pseudomonas syringae, but following DNA-relatedness studies, it was recognized as a separate species and P. syringae pv. tagetis was incorporated into it, as well. Since no official name has yet been given, it is referred to by the epithet  'Pseudomonas helianthi' .

Pathovars
 'Pseudomonas helianthi'  pv. helianthi attacks sunflowers (Helianthus annuus).

 'Pseudomonas helianthi'  pv. tagetis attacks marigolds (Tagetes erecta).