Causes of Deformed Mushrooms in Agaricus bisporus and Their Prevention and Control Methods

1. Deformed mushrooms. When ventilation is poor and the carbon dioxide content in the mushroom house exceeds 0.3%, deformed mushrooms are likely to appear. If the fruiting position is too deep, mushrooms growing between the cracks of the coarse soil also tend to be deformed. The key to prevention and control is to pay attention to ventilation and air exchange in the mushroom house.

2. Red root mushrooms. Slightly acidic cultivation material, a high-temperature stage before fruiting, excessive water content in the casing soil layer, excessive application of glucose as a supplemental fertilizer, and poor ventilation in the mushroom house can all easily lead to red root mushrooms. The pH of the compost should be properly adjusted, the water content of the casing soil should be maintained at 22%-25%, watering should be avoided during high temperatures, and the concentration of supplemental fertilizer should be appropriate.

3. Hollow-stem white-core mushrooms. If too little water is sprayed, the casing soil layer is relatively dry, and the fruiting bodies cannot obtain sufficient moisture, the mushroom stems develop a white pith, or even become hollow. The main preventive measure is to spray water at the right time and in the right amount so that the relative air humidity in the mushroom house during the fruiting period is maintained above 85%.

4. Thin-skinned mushrooms that open their caps early. If the fruiting density is too high, the temperature is somewhat high, or the humidity is somewhat low, the fruiting bodies grow quickly with thin stems and thin caps, and will open their caps early. Paying attention to maintaining the temperature and humidity in the mushroom house can effectively prevent the appearance of thin-skinned mushrooms that open their caps early.