Plywood produced with rotary-cut veneers of Pinus sylvestris impregnated with a solution of 1.3 M 1.3-dimethylol-4.5-dihydroxyethyleneurea (DMDHEU) and glued with a phenolic resin (Prefere 4976 DYNEA) were inoculated with Coniophora puteana, Coriolus versicolor and Pleurotus ostreatus, following the European standard ENV 12038. The specimens were leached following European standard EN 84. The results of the virulence and size control samples reached the standard minimum required mass loss (20 %). Both treated and untreated samples presented less fungi attack when no leaching was performed, with the exception of the samples inoculated with P. ostreatus. Fungi inhibitor properties were attributed to the glue. The material proved to be highly susceptible to C. puteana, showing a mass loss of 40 % in untreated leached specimens. The mass losses observed in the treated non-leached samples were attributed to the loss of un-reacted DMDHEU during the inoculation time. This phenomenon was clear in the samples inoculated with P. ostreatus, which were surrounded by vermiculite in a high moisture content environment.

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