Entomopathogenic fungi (EPF) take on greater significance in the biological pest control.The aim of my master thesis was to investigate interactions between products of the honey bee, Apis mellifera and the entomopathogenic fungi Beauveria bassiana (soil- and beetle isolates), B. brongniartii, Metarhizium anisopliae, M. flavoviride and Isaria fumosorosea, in order to avoid negative impacts on the honey bee. The impact of propolis, royal jelly, lime- and acacia honey on EPF was analysed performing tests on germinationrates and growth assays. Royal jelly revealed the strongest inhibiting effect on all EPF used, by using the disk diffusion test and formulation of conidia with royal jelly. The second-strongest inhibition is exhibited by lime honey (disk diffusion test and formulation with honey with a 20 % dilution). With higher dilution rates (50 %) of the honey, germination rates were considerably higher. Using the formulation of the conidia with lime honey-concentrate, B. bassiana (soil isolate) and I. fumosorosea showed germination rates of 80 95 % after 24 h. The weakest inhibition resulted from acacia honey (disk diffusion test, 20 % and 50 % dilution of honey) and propolis, but still the inhibition was significantly after 24 hours in comparison to the control for most cases. The germination-inhibiting effects were reversible for all substances, except royal jelly. The growth assays revealed contrary results compared with the germination-tests often. The growth of I. fumosorosea was only marginally constrained, B. bassiana (soil isolate) showed strongly pronounced growth-restricitons. Inhibition-zones and growth-inhibitions were irreversible in few cases. Bee products showed strong antimicrobial actitvity partially. Therefore, the undesirable effects on the bee colony coming from the use of suitable EPF are unlikely to appear.