EN
The aim of the performed research was to investigate the occurrence of bacterial diseases of maize in Poland and also a characterization and diagnostics of maize pathogenic bacterial species. Using biological, biochemical, serological and molecular methods a collection of nearly 200 isolates was analyzed. It was found that bacterial isolates belonged to the following genera: Erwinia, Pantoea, Xanthomonas, Xylophilus, Acidovorax, Enterobacter, Pseudomonas i Bacillus. By all used diagnostics methods the presence of 4 isolates of Pantoea ananatis species was confirmed. This species is well known bacterial plant pathogen of maize and many other plants. However, its presence was recorded in Poland for the first time. A bacterial population naturally existing together with plant pathogenic Pantoea ananatis was also characterized.