A new bacterial disease of linden on territory of the Ukraine is described. Typical symptoms of disease are a premature yellowing and falling of leaves in adult trees are complete dryness of young trees. Biological properties of the pathogen distinguished from typical speciesPseudomonas aeruginosaand fluo‐rescentic phytopathogenic bacteria (P.syringae pathovars, P. viridiflava, P. marginalis, P. cichory)of the genusPseudomonasand appears to be unique.