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What to Do When Bumps Appear on Oyster Mushroom Caps? Detailed Prevention and Control Methods

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This condition generally occurs in winter. The upper part of the mushroom cap, especially the edge, becomes covered with bumps of varying sizes. In severe cases, the entire cap is covered with bumps. Once bumps form, the fruiting bodies grow extremely slowly. This disease affects both the commercial quality and the yield. The main causes of bump formation are: (1) Fires are lit inside the cultivation room to raise the temperature, causing carbon dioxide to accumulate. (2) The cultivation bags are placed near air vents, and stimulation by cold drafts causes disordered cell growth inside and outside the oyster mushroom cap, resulting in bumps. Prevention and control methods: Strengthen ventilation and air exchange, and harvest all oyster mushrooms with bumps.

This condition generally occurs in winter. The upper part of the mushroom cap, especially the edge, becomes covered with bumps of varying sizes. In severe cases, the entire cap is covered with bumps. Once bumps form, the fruiting bodies grow extremely slowly. This disease affects both the commercial quality and the yield.

The main causes of bump formation are:

(1) Fires are lit inside the cultivation room to raise the temperature, causing carbon dioxide to accumulate.

(2) The cultivation bags are placed near air vents, and stimulation by cold drafts causes disordered cell growth inside and outside the oyster mushroom cap, resulting in bumps. Prevention and control methods: Strengthen ventilation and air exchange, and harvest all oyster mushrooms with bumps. If fires must be lit inside the cultivation room for heating, use a draft pipe or a fire wall to direct smoke and carbon dioxide outside; when ventilation and air exchange are needed, do it between 10:00 and 15:00 each day when the temperature is high.

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