The effect of infections with Trichoderma aggressivum f. europaeum on the yielding of seven wild and one commercial strain of Agaricus bisporus (Lange) Imbach. was investigated. Wild strains of the mushroom were derived from natural habitats of Poland. The cultivation substrate was inoculated with two different isolates of T. aggressivum f. europaeum Th2. It was found that infections of the substrate with these isolates resulted in a very serious decrease in mushroom yield. The examined mushroom strains showed different reactions to the infections with Trichoderma isolates.
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