EN
The aim of presented investigations was to learn the effect of interaction of metal ions (Pb, Zn, Cd, Cu, Ni, Mn and Mg) on В. bassiana. Intensity of В. bassiana sporulation was limited by lead and copper. Those ions limited also fungus spores ability to germinate and the length of germinating mycelium hypha. A protective effect of magnesium against heavy metal ions was observed.