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Antagonism Between Isolates of a Snow Mold Pathogen. J. B. Lebeau, Head, Plant Pathology Section, Research Station, Agriculture Canada, Lethbridge, Alberta, Canada T1J 4B1; Phytopathology 65:877-880. Accepted for publication 11 March 1975. DOI: 10.1094/Phyto-65-877.

Mixing pathogenic isolates of an unidentified basidiomycete which caused snow mold (also called winter crown rot) on legumes and grasses in western Canada caused lower virulence and growth, but had no significant effect on the production of β-glucosidase. No apparent relationship between pathogenicity and secretion of this enzyme by the fungus exists. Virulence was restored and production of β-glucosidase increased when an avirulent isolate was mixed with virulent strains.