(1) Hazardous symptoms mostly occur in the material and soil layers before and after the soil covering, and short and thick white hyphae appear first, and then a granular fruit resembling walnut meat is formed. The fruit of the ascus is born on the surface and material layer of the covering soil. In the competition for mushrooms with mushrooms, hinder the formation of mushroom fruiting bodies. The fruit of the asca fruit matures and the ascospore bursts releasing a large number of ascospores. When the mushroom occurs in the mushroom strainer bottle, there is a smell of bleaching powder in the bottle.
(2) Morphological characteristics Mycelium white stout, with diaphragm, branching. Ascomygoa fruit consists of hyphae, dense, veined and interspaced, walnut-shaped or bovine brain-shaped, irregularly wrinkled on the surface, and initially milk-white dots, gradually becoming irregular masses, dark when ripe red. The fruit of the ascospores is borne with an ascitic sac. The ascaria is ovoid to spherical in shape and irregularly arranged. It contains 8 ascospores, and the ascospores are colorless and nearly spherical.
(3) The law of occurrence mainly exists in the soil and enters the mushroom bed with the aid of the site, cultivation materials, soil cover or bacteria. The suitable temperature for the growth of mycelia is 26-30 °C, the suitable temperature for germination of ascospore is 24-27 °C, the suitable pH is 4.5-7.5, high temperature and high humidity are conducive to the occurrence of the bacteria, ascospores are resistant to high temperature, and after fermentation High temperature has no lethality to the spores. If the temperature of the mushroom room is controlled below 18°C, this disease can be avoided.
(4) Prevention and control methods Strictly inspect bacterial strains to prevent strains from carrying bacteria; one fermentation must be performed on the cement floor to avoid contamination of pathogens; pay attention to the ventilation of the mushroom house; after the onset of the mushroom bed, stop the spraying of water on the bed surface until the cover soil is slightly dry , Excavate the capsule fruit, the room temperature is reduced to 16 °C below, according to conventional management, still normal mushroom.
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