To protect wood against wood decay fungi and insects, wood preservatives that fully penetrate into wood, need to be applied. In practice, wood preservatives are applied only by brushing. Such preservation is considered insufficient, but there are no literature data about fungicidal effectiveness of such a procedure. Small holes were drilled into specimens (2.5 cm * 2.5 cm * 5 cm), made of Norway spruce sapwood, for this issue. Small sticks were introduced into these specimens and axial surfaces were sealed with epoxy coating. Longitudinal surfaces of the specimens were afterwards surface treated with 4 different commercial wood preservatives,and exposed to 3 different wood decay fungi. In defined time periods, the sticks were isolated from the specimens and transferred to petri dishes with nutrient medium. Afterwards we observed, whether hyphae germinated or not. Our results indicate that surface protection with biocides is not sufficient against wood decay fungi. On the other hand, there was only 1 test applied, and we are not certain if the optimal procedure for estimation of fungal colonization was used.
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