From practical reasons, qualitative spraying methods are widely used for the detection of bifluorides and boron in wood. The main aim of this research was to detect whether the concentration of the active ingredient in the coloured area is equal or greater than the toxic value against basidiomycetes. Both colouring methods, Z-A reagent for fluorides and curcuma reagent for boric acid, are a reliable means for the determination of the toxic threshold value, (found in literature) against basidiomycetes in spruce wood. Quantitatively, for fluorides the Eriochromocyaninezirkoniumoxidchloride method (DIN 52161 part 4) and for boron the mannitol - azomethine method (Peylo, 1993; Merck, 1989) are easy to perform and accurate

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