Effects of malt and agar trademarks used in growth media on growth of fungi in cultures, amount of decay they cause in birch samples and their resistance to stilbenes were tested. It was tested also had the conditions where fungus cultures were stored before inoculation of test plates some effect on the results. Fungi used in these tests were white rot fungus Trametes versicolor and brown rot fungus Piptoporus betulinus. Stilbenes used were pinosylvin and resveratrol. The tested trademarks of agar had no effect but trademarks of malt had statistically significant effect on growth, decay and resistance to stilbenes. Storage conditions of cultures before tests had less effect on results, they effected mainly when the growth conditions during test were unfavourable to the fungi.

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