Evaluation of the Efficiency of Some on Offers Wood Preservatives

Recent investigations have shown microfungi to be prevalent in woods with high concentrations of naturally decay-resistant compounds and woods preserved with various chemicals. Microfungi may have metal leaching ability or be able of degrading a toxic compound into a less potent form, and in such a way neutralize wood preservatives. The efficiency of three wood preservatives (Asepas-1, Dispersan 1.1.1 and Arlits), containing copper salts, was tested in contact with agricultural and forest soil. Microbiological infection and weight loss of treated wood blocks were chosen as criterion for wood preservative efficiency evaluation. No representatives of Basidiomycetes that are responsible of wood major decay were isolated from treated samples even after 18 months. Nevertheless the infection of all treated wood blocks by microfungi was noticed and weight losses of wood samples were fixed: the efficiency of preservatives was depended on environment. The greatest weight loss among all tested preservatives in the agricultural soil was of Dispersan 1.1.1 treated wood (7.29 %) but of Arlits – in the forest soil (12.62 %). Species of the Mucor genus dominated on samples from forest soil and representatives of Fusarium genus were isolated from all treated wood blocks buried in agricultural soil after 18 months of burial. Key words: wood, wood preservatives, preservative efficiency, soil fungi. INTRODUCTION∗ An extremely wide variety of chemicals have bee