Propagation of Molds on Red Alder Roundwood–Their Effect on Oil Soak Treatments

Growth of four fungi including Trichoderma sp., Fusarium sp., Gliocladium roseum, and Chaetomeum cochliodes was satisfactory on the wood only when a fluoride salt was present. Concentrations of 1.5 to 3.0 percent were near optimum. Other additives tried were not helpful. Trichoderma sp. was the dominant fungus from a mixture inoculation. Light steaming caused only a short term growth advantage. Good fungal growth produced twice the oil absorption of non-infected wood. Trichoderma was usually the best. It seems unnecessary to remove the inner bark before inoculation. Exploratory tests indicated vacuum impregnation was much more effective than cold soak. The hyphae traveled through all types of cells in the wood and even pierced fiber walls.

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