Main bacterial infection reasons of King oyster mushroom are:
1. Infected raw materials are mixed in material.
2. Lack of time of sterilization.
3. Overmuch or over tight mushroom bags in sterilizing stove.
4. Insufficient water absorption on bits of wood or corncob.
5. Inadequate cool air exhaust in pressure-cooker.
Solutions:
1. Choose raw materials which are fresh and have no mildew.
2. After boiling, people should continue to sterilize for 10 to 12 hours in big fire.
3. Leave 1 cm gap between row and wall.
4. When choosing corncob or bits of wood as compost, people should soak them till see no white heart.
5. When using pressure-cooker, farmers should open exhaust valves when the pressure reaches 0.05MPA, exhaust cool air sufficiently and them close exhaust valves.