The purpose of this paper is the synthesis of more important results of basic and applied research that have been grouped in the following problems: 1.: Fungi causing blue stain in the pine wood, occurring in Poland. 2.: Moisture content changes of pine sawtimber and sawn timber as the factor of blue stain producing fungi development. 3.: Effect of sapwood moisture content on the degree of wood staining in dependence on wood preservation methods and sawn timber quality. 4.: Effect of pine sawtimber harvesting period and storage time on sawn materials quality. 5.: Protection of pine sawtimber and sawn timber with chemical compounds. 6.: Problems of economics of sawtimber and sawn timber preservation.

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