Studies were carried out on fungicidal values of fourteen potential wood preservatives – modified quaternary heteroaromatic compounds using the screening agar-block. The vacuum treated blocks (22mm x 17mm x 12mm) of Scots pine (Pinus sylvestris L.), spruce (Picea excelsa L.), beech (Fagus silvatica L.) and birch (Betula verrucosa Ehrh.) with testing compounds were exposed to Coniophota puteana and Trametes versicolor for 4 and 6 weeks. The part of treatment samples was leached according to EN 84, then the toxic value and degree of leaching from wood of compounds were determined. The optimal fungicidal activity against Coniophora puteana was observed for imidazolium salts with linear hydrophobic substituents (1.1 kg/m3 - !.6 kg/m3). The aromatic substituents reduced the toxic activity of studied chlorides. The imidazolium propionates were less effective then chlorides with the same cations structure. The investigated compounds were well good fixed in the wood of Scots pine, leaching coefficient was from 1.0 to 1.6. The toxic value against Chaetomium globosum (investigated by block-perlite method) of two imidazolium chlorides with linear alkoxymethyl substituents was 3.5 times less (5.5 kg/m3) then against brown rot fungi Coniophora puteana (1.1 kg/m3). The observation using scanning electron microscope of colonization and decaying of treated wood by testing fungi were confirmed obtained toxicometric results of new, potential wood preservatives.

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