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Abstract: One of the major diseases currently impacting cultivated Agaricus bisporus mushroom production worldwide is Trichoderma green mold, caused by the fungus, Trichoderma harzianum The epidemiology of this fungal disease is poorly understood and controversial Based on the results of an on-farm survey the spawn gram, flies and compost conditions were identified as important components of the Trichoderma disease complex This research smdied several different parameters that influenced Trichoderma competitiveness with Agaricus Results suggested that T. harzianum growth and disease development is influenced by spore concentration and compost moisture Different fungicide-treated spawn and spawn-ran compost as spawn was determined to be effective in delaying disease development Different spore infested materials were removed after Phase II, T. harzianum failed to survive the Phase II temperatures and T. harzianum was killed soon after the start of Phase II composting.
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