Suppression of Gray Snow Mold on Creeping Bentgrass by an Isolate of Typhula phacorrhiza

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Abstract
Field studies were conducted in 1983 and 1984 to determine the effects of Typhula phacorrhiza (isolate T011) and T. ishikariensis var. ishikariensis (T. i. var. ishikariensis) (isolate T004) alone and in combination on creeping bentgrass [Agrostis palustris]. Isolate T011 was nonpathogenic; isolate T004 caused foliar blight and crown decay. Significantly less foliar necrosis was observed on bentgrass inoculated with combination of isolates T011 and T004 than on bentgrass inoculated with isolate T004 alone. Sections of a creeping bentgrass golf green with a history of infection by T. ishikariensis showed 44 and 70% less gray snow mold when infested with 100 and 200 g/m2 of wheat-grain inoculum of T. phacorrhiza in 1983 and 1984, respectively. Laboratory tests failed to reveal parasitism or hyphal interference among isolates of T. phacorrhiza, T. incarnata, and T. i var. ishikariensis in culture. However, results of additional experiments indicated that growth of T. incarnata and T. i. var. ishikariensis was suppressed on BASM agar that had been exposed to T. phacorrhiza. Application of BASM broth to the exposed agar reduced the suppressive effects.