In 1998 and I 999, the research on the contents of entomofauna settlement of Heracleum Sosnowskyi Manden was carried out at Mochełck, and in 1999 - at Minikowo near Bydgoszcz. Useful insects were the most abundant group in the tested habitats. Based on the results of the investigations, it can be concluded that only two species: blunt's flat-body (Depressaria depresel/a Hb.) and celery fly (Phi/lophylla heraclei L.) may be of any importance in the fight against population of this plant.