Mushroom tumors, often referred to as "mushroom-like tumors," typically appear after the first harvest and prevent the formation of the second flush. These tumor masses originate from inside the growing bag, gradually developing upward and appearing in sizes ranging from broad beans to large eggs. The surface of the tumor is covered with small, fine nodules—smooth, irregularly shaped, and varying in size. Some are single, while others merge together. In the early stages, they are firm, but once the temperature rises above 18°C, they begin to decay slowly. These tumors are difficult to detect in the early growth phase, and usually become visible only when the surface of the medium is exposed or when the cultivation bag swells during the middle stage.
The main cause of these tumor formations is improper handling during the bagging or transportation process, which can lead to internal voids or cracks in the bags. These gaps provide an ideal environment for the mycelium to grow, with sufficient nutrients, proper temperature, and humidity. As a result, fruiting body primordia may form within the gaps. However, due to the lack of optimal conditions, these primordia cannot develop into normal mushrooms. Instead, they regenerate repeatedly in the voids, eventually forming larger tumor masses.
Flammulina mushroom tumors absorb a significant amount of nutrients and water during the production process, but they are hard to detect at an early stage. Their rapid growth in the medium stage can hinder the development of healthy fruiting bodies on the surface of the bags, causing them to shrink or grow very slowly, becoming thin and weak. Even if some needle-like mushrooms do emerge, their growth is extremely slow. Once the tumor appears, no normal fruiting bodies can develop.
To prevent and control this issue, it's crucial to ensure that the culture material is evenly and tightly packed during bagging. During transportation and unloading, the bags should be handled gently, avoiding stacking to reduce the risk of internal damage. Timely and scientific management practices should also be implemented to promote rapid and healthy growth of the fruiting bodies. By following these steps, the occurrence of mushroom tumors can be significantly reduced, ensuring better yield and quality.
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