Effect of nutrients on interactions between two decay fungi and Trichoderma harzianum Rifai on ponderosa pine sapwood wafers

Small size wood assays were utilized to study the effect of added nutrients to the wood on the interactions of *Trichoderma harzianum* Rifai and two wood decay fungi, *Trametes versicolor* (white rot) and *Gloeophyllum trabeum* (brown rot). Weight losses related to time of exposure were monitored as a measure of decay. Total protein content from extracts obtained from ponderosa pine sapwood wafers treated with different levels of carbon or nitrogen compounds served as an indicator of biomass. The activities of selected wood degrading enzymes were studied in pure and mixed cultures of *T. harzianum* and the two decay fungi growing on the wood wafers.