Microbiocides obtained from mutant culture Streptomyces rimosus SC-36 were evaluated for their abilities to inhibit the growth of brown-rot, soft-rot, white-rot, and sapstain fungi on wood. The test fungi were the brown-rot fungi Antrodia carbonica, Gloeophyllum trabeum, Neolentinus lepideus, and Postia placenta; soft-rot fungi Chaetomium globosum, Paecilomyces variotti, Phialocephala dimorphospora, Phialophola mutabilis, Scytalidium lignicola; and white-rot fungi Flammulina velutipes, Phanerocheate chrysosporium, Shizophyllum commune, and Trametes versicolor. The SC-36 treatment inhibited basidiospore germination and mycelial growth of test fungi in plate assay, plate bioassy, and wood-block (southern yellow pine and sweetgum) tests. Metabolites from SC-36 inhibited the growth of all test fungi. In field trials, the metabolites and living cell treatment of green pine log sections and field wood-blocks (eastern white pine and red maple) inhibited natural spore germination and mycelial growth of all forest-inhabiting fungi, thus preventing wood biodeterioration and biodiscoloration. Our results demonstrated that SC-36 can be used as an alternative to synthetic chemicals and an environmentally benign biological wood preservative.

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