Bifidobacterium microspore: This fungus is the most common and harmful miscellaneous bacteria in bed culture of Agaricus blazei Murill. Once it happens, it is difficult to cure. If we continue to plant in the old land, the disease will get worse year by year, or even no harvest. Juglans regia and Agaricus blazei mycelium compete for nutrients in the culture medium and inhibit its growth. The mixed mycelium grows in the culture medium for about 7 days, and then it will kink to produce an ascocarp, which is irregular in shape and 0.5 ~ 4.0 cm in diameter. It was white at first, then gradually turned yellow and dark brown. Shaped like walnut kernel, a large number of ascospores spread after the ascomycete matured. Mixed bacteria can survive in soil and culture materials. Soil and culture with bacteria are important sources of bacterial bed disease. The suitable growth temperature of mixed bacteria is 25 ~ 30℃. High temperature, high humidity, poor ventilation and sour culture materials all led to the growth and spread of fermented grains.

Control method: ferment the culture material. Straw and cow dung culture materials should be fully fermented, and secondary fermentation should be carried out as much as possible to completely kill miscellaneous bacteria. Thoroughly disinfect the room before feeding, and spray 2% formaldehyde solution on the floor and bedstead. Ensure the quality of covering soil. Deep soil should be used to borrow soil, and surface soil should be avoided. Adjust the soil pH with lime, and spray the soil with carbendazim solution of 1∶800 to prevent the soil from carrying bacteria.