The blue-stain fungi cause discoloration of the wood. In the course of their development in wood may have an effect on wood structures and properties influenced on its use value. Investigation has been undertaken to clear the influence of blue-stain fungi on wood absorptiveness as indicators for the wood ability to impregnation with water diluted wood preservatives. The wet sapwood samples of fresh cut Scots pine (Pinus sylvestris L.) were infested with pure cultures of fungi: Ceratocystis penicillata (Grosm.)C.Moreau, Cladosporium herbarum Pers. ex Fries, Discula pinicola (Naum.) Petr. or their mixture. The samples of the wood were than exposed into thefungi action through 1, 3 and 12 month period. The absorptiveness of blue stained wood samples and their twin control samples were determinate and compared after each incubation period. The absorptiveness of the stained wood increased greatly particularly after 3 and 12 month of being infected by fungus or fungi. The mean increase of infected wood absorptiveness was great. It reached several dozen percent more than control wood. Such differences showed on grater ability of blue-stained wood to impregnation with water diluted wood preservatives than control wood not infested by the blue-stained fungi.

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