In the presented study, a bacterial flora of an important poplar pest, the willow flea beetle Crepidodera aurata (Coleoptera) was studied for the first time to propose ecologically alternative control agents. The five species of entomopathogenic bacteria, four non-spore forming and one spore forming: Staphylococcus aureus, Staphylococcus sciuri, Bacillus circulans, Bacillus thuringiensis and Kocuria kristinae were identified. Bioassay experiments showed that all isolated bacteria have insecticidal effect on the adults of C. aurata. Based on the results of mortality in the adults of C. aurata resulting from an application of different bacterium species it was concluded that B. thuringiensis might be the most potential bacterium control agent (69.2% mortality) then B. circulans (53.8%), S. aureus (54.5%), S. sciuri (66.6%), and K. kristinae (60%). This is the first study on the bacterial pathogens of C. aurata.

Celem przeprowadzonych badań było oznaczenie flory bakteryjnej występującej na szkodniku topoli Crepidodera aurata (Coleoptera), z uwzględnieniem opracowania alternatywnych, ekologicznych środków zwalczania. Zidentifikowano pięć gatunków entomopatogenicznych bakterii, z których Staphylococcus aureus, Staphylococcus sciuri, Bacillus circulans, Bacillus thuringiensis należą do grupy nieformującej zarodników i jeden gatunek Kocuria kristinae – zakwalifikowany do grupy tworzącej zarodniki. Przeprowadzone testy biologiczne wykazały owadobójcze właściwości wszystkich wyizolowanych gatunków bakterii, przy czym śmiertelność dorosłych osobników C. aurata wynosiła przy zastosowaniu B. thuringiensis 69,2%, B. circulans 53,8%, S. aureus 54,5%, S. sciuri 66,6% i K. kristinae 60%. Gatunek B. thuringiensis może być potencjalnym gatunkiem wykorzystywanym do zwalczania C. aurata. Są to pierwsze badania dotyczące bakteryjnych patogenów szkodnika topoli C. aurata.

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