The same standard test D1413 was applied to wood plastic composites (WPC), specimens prepared by hot press system with 40% polypropylene and 60% particles of pine, maple or oak wt/wt. After 12 weeks of Trametes versicolor exposure, the maple samples showed 16 wt % loss while the oak samples showed 13 wt % loss . All these cases have shown lower resistance to T. versicolor than the composites prepared by our method.