T. versicolor caused decreased weight losses in MDF specimens produced from pine, oak, and mixed furnish compared to the brown-rot fungus, G. trabeum (Fig.4). Weight losses in pine and oak solid wood specimens exposed to T. versicolor were greatly decreased compared to G. trabeum while weight losses in beech solid wood specimens greatly increased. In the T. versicolor bioassay, MDF specimens containing beech furnish and beech wood specimens showed the least resistance i.e. greatest weight losses among the specimens tested.