Mushrooms are infected with cotton floc-like bacteria.

Cotton flocculent bacteria are also known as powdery mildew and variable Alternaria. The bacteria is mainly caused by the dung of the culture material brought into the mushroom room. At the initial stage, most of them spread among the soil grains and soon grew to the surface of the soil layer, and their hyphae were short and thin, growing in clusters, showing a blossoming cotton or layers of rotten cotton, white, and then gradually turned orange. In the disease area, the mycelium growth of mushroom was very poor, and a large number of young mushrooms and primordia withered and died.

Prevention and control measures: fermentation of culture material must be thorough. When the bacteria grows to the surface of the soil layer, spray 500 times carbendazim with 0.7 kg per square meter, or spray 500 times 50% wettable topiramate with 0.5 kg per square meter (if the disease occurs year after year, you can mix it with 800 times carbendazim). However, the application time must be carried out when the young mushrooms have not yet been unearthed, in order to prevent the fungicide from killing the mushroom mycelium.