This work discusses decay resistance of robinia wood to fungi Trametes versicolor (L.ex Fr.) Pil. and Coniophora puteana (Schum. ex Fr.) Karst., and also the possibility of influencing its resistance by means of chemical protection. The results showed that natural resistance of robinia wood to these two different agents of wood decay is not the same. It is much less resistant to the fungus Coniophora puteana (Schum. ex Fr.) Karst. than to the fungus Trametes versicolor (L. ex Fr.) Pil. Under certain conditions resistance and, consequently, durability of robinia wood can be increased, if it is impregnated with a chemical using the basis of copper-napthenate.

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