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  • Author: Robert A. Blanchette x
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Phlebiopsis gigantea, a white-rot fungus currently being tested in biological processing applications for the pulp and paper industry, was shown to effectively inhibit blue stain fungi in both laboratory and field trials. Inoculation of logs with P. gigantea shortly after cutting resulted in up to 86% colonization of logs in the laboratory and 100% in field studies. Colonization of logs by blue stain fungi such as Ophiostoma piliferum and O. piceae was greatly reduced or completely inhibited with prior inoculation by P. gigantea. In field studies, blue stain fungi colonized up to 53% of the sapwood and stained as much as 31% of the sapwood in non-inoculated control logs in contrast to 4% colonization and 2% stain in treated logs. Logs inoculated with O. piliferum 2 weeks prior to inoculation with P. gigantea were 88% colonized by O. piliferum and had 33% of the sapwood stained after 7 weeks, and 33% colonized and 18% stained after 29 weeks. Scanning electron micrographs of P. gigantea and O. piliferum hyphae showed P. gigantea parasitizing the blue stain fungus. Phlebiopsis gigantea was shown penetrating and growing adjacent to collapsed and disintegrated blue stain hyphae. Phlebiopsis gigantea also decolorized sapwood previously stained blue.