'P. helianthi' , P. tremae , P. cannabina , and P. viridiflava ). The remaining pathovars are as follows: Pseudomonas syringae pv. aceris attacks maple Acer species. Pseudomonas syringae pv. aptata attacks beets Beta vulgaris . Pseudomonas syringae pv. atrofaciens attacks wheat Triticum aestivum . Pseudomonas syringae pv. dysoxylis attacks the