Green mold of Mushrooms

Symptoms and Effects. When mushroom beds spawned with the cultivated mushroom, Agaricus bisporus, are infested with Trichoderma green mold, non-productive areas occur on the casing surface resulting in serious yield losses. Trichoderma spp. have traditionally been found as weed molds in compost, causing only limited green patches on casing/compost or cap spotting on mushrooms.
Green mold is characterized by dense white mycelial growth followed by extensive green sporulation of the fungus. Apparently normal spawn runs can give way to large patches of green Trichoderma sporulation.
Browning of Agaricus mycelium and lysis of small pins is visible macroscopically at the advancing edge of green mold and suggests enzymatic degradation.