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Abstract: One of the most serious diseases of button mushrooms [Agaricus bisporus (Lange) Singer] is the green mould, which is caused by different species of Trichoderma. This fungus initially produces a dense pure white mycelium, which resembles to mushroom mycelium and is very difficult to differentiate from it. Later on mycelial mat on casing layer gradually turns to green color because of the heavy spomlation of causal agent, that is a characteristic symptom of the disease. Thereafter, the mould creeps to surface of the casing layer and infects the new parts and developing newly bome primordia. This produces brownish lesions /spots on the developing fruit bodies, which later join together and completely cover them. Emerging fruit bodies through infected casing layer showed badly spotted, brownish color, and reduction in both the growth rate and the yield performance. Disease samples from mushroom farms were collected and several species of Trichoderma were identified, including Trichoderma harzianum Rifai (1969), T. longibrachiatum Rifai (1969), T. virens (Miller, Giddens & Foster) and Trichoderma sp. Results of the growth pattems in 25°C showed significant differences in the type of growth and spomlation pattems between various species and isolates. Each isolate had several growth pattems. However regarding distribution and relative abundance, each species showed different pattems in the surveyed mushroom farms. Fortunately, most of the pathogenic species were observed in all the samples such as pasteurised and nonpasteurized compost, casing layer and mushroom beds too. Besides in this smdy, we have also determined growth pattems and growth verified these effects on growth pattems as well as their morphological characteristics.
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