The experiment was conducted at the Uniwersity of Agriculture in Cracow. The aim of experiment was to evaluate the ability of entomopathogenic fungi to colonised plants phyllosphere and peat soil. The seeds of maize and faba bean were dressed with spores of entomopathogenic fungus Isaria fumosorsea (dose 4,2 x 1011 spores/1 kg seeds). I. fumosorosea was cultured on Sabouraud Dextrose Agar medium. The method of trap insects (larvae of Tenebrio molitor L.) was used for evaluation of soil colonization by I. fumosorosea. The occurrence of entomopathogenic fungus on plant leafs was also observed. The entomopathogenic fungus Isaria fumosorosea applied with seeds can quickly colonizes soil and the phyllosphere of plants. The entomopathogenic fungus I. fumosorosea may be used to protect plants against soil and aboveground insects. The results indicate the possibility of seed dressing with entomopathogenic fungi in ecological farms.