Pleurotus ostreatus on top of mud mushroom

Symptoms: it mainly appears in the early stage of mushroom emergence, the fruiting body is low, usually occurs in the culture material, the material surface or the lower part of the coarse soil layer, and breaks the top of the soil when it grows up.

The causes are as follows: 1. When the temperature, humidity and air conditions in the culture material are suitable for fruiting body growth, the mycelium will kink around the soil to form a primordium. After the primordium differentiation, it grows upward and comes out of the top mud. If the upward conditions are not suitable, it will turn around and grow under the bed to form bed mushrooms. 2. If the water transfer time of coarse soil is too long, the excessive ventilation of mushroom room and the decrease of temperature of mushroom room will inhibit the growth of mycelium into coarse soil and promote the mushroom formation too early; the fine soil cover is too late and thick, and the water transfer is not timely; the water transfer is too fast, too urgent or the ventilation time is too long after water transfer, the humidity of the soil layer is not enough, and the mycelium does not go up to the fine soil for a long time, which will depress the mushroom position. 3. Spraying water too early, too quickly or too much water spray will inhibit the upward growth of the mycelium in the soil layer and force the mycelium to kink between the coarse soil particles, thus reducing the mushroom position, resulting in sparse mushroom production, abnormal mushroom position and the increase of Pleurotus ostreatus.

Preventive measures: 1. When laying the culture material, the soil clods mixed in the material should be picked out. 2. Cover the soil evenly and cover the fine soil as far as possible when the coarse soil layer has not yet formed a small bacterial bud. 3. The water transfer in the soil layer should be uniform and properly ventilated, and ventilation should be reduced after the water transfer. 4. In the stage of mycelium culture in the soil layer, it is necessary to control the temperature of the mushroom room, prevent the temperature from being too low, and maintain a certain relative humidity of the air (about 85%), so as to promote the mycelium to grow into the soil layer, hang the mycelium growth part, and spray the mushroom water properly at the right time to prevent the mushroom from setting early and the mushroom position too low.