This paper presents the process and the results of studies on fungitoxicity level of the chosen phenolic compounds occurring in wood that can be responsible for the natural resistance of this material to decay by fungi. All together 14 substances were examined: Eugenol, Vanillic acid, Isoeugenol, Cyclohexanone, Resorcinol, Syringaldehyde, 2,6-dimethoxyphenol (Syringol), Pyrogallol, 4-methoxybenzoic acid (Anisiic acid), 2-furaldehyde, Furanone, 4-allyl-2,6-dimethoxyphenol, Tetramethyl-4-butanediamine and 3',5'-dimethoxyacetophenone and 6 different mixtures of these compounds imitating their natural coexistance in wood. For the tests the modified AG nutrient agar medium method based on using a series of media plates of various saturations of the tested substance was used. Trametes versicolor and Laetiporus sulphureus served as the test fungi. All together 20 variants of the experiment were pursued on 2400 plates. On this basis the fungitoxicity level of each substance was determined and they were evaluated in regards of their potential usefulness in the practical protection of trees and wood.

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