Also known as fake truffles, veal and German microspores. It often occurs before and after the mushroom autumn mushroom is covered with soil and in the late spring mushroom period. Occasionally, it will happen in a strain bottle with dung grass as the culture. At first, dense white or milky white cotton-wool hyphae were produced in the material, on the surface of the material and on the covering soil, and a large number of conidia were produced, forming a reddish-brown ascus, which looked like walnuts and was dark brown when mature. When fermented grains appeared in the mushroom bed, the growth of mushroom mycelium was inhibited and eventually disappeared. The medium is dark brown and wet rot. When the tide mushroom grows walnuts for the first time, the mushroom yield can be reduced by more than 50%. When walnut is seriously infected, the culture medium often produces 1 pungent bleaching powder smell, which can be used to diagnose walnut. Mushrooms are no longer formed in the bed of heavy bacteria.
cause of a disease
Dichliomyces microspora(Diehl, et Lambert)Gilkey belongs to Ascomycetes, Ascomycetes, Ascomycetes, and Derris belongs to Gallus. The hyphae are thick, branched and septate. Ascomycetes are sessile and have particles similar to walnuts. Ascomycetes are arranged in a round or oval shape and contain 8 ascospores. When the ascospores mature, the ascospores dissolve and release themselves. Ascomycetes are monospora, spherical, colorless and smooth.
Occurrence characteristics
Cun grows in the soil. Spores can be spread by air, mushroom trays, tools, other equipment, mulch and compost. Ascomycetes have strong viability, high temperature resistance (80℃, 7 hours), drought resistance and chemical resistance. Under the condition of mushroom mycelium, it can promote the germination of Juglans mandshurica spores. The optimum growth temperature of germinated mycelium is 26 ~ 28℃, and it is easy to get sick under the conditions of high temperature and humidity, poor ventilation, acidic culture materials and soil covering.
Prevention and cure method
(1) Improve the environmental sanitation of mushroom house.
(2) secondary fermentation and soil covering disinfection to prevent the culture material from carrying bacteria.
(3) Strictly check the strains. When bacteria are found to smell of bleaching powder, hyphae and ascomycetes are too thick and too short, they should be eliminated.
(4) The medium should not be overcooked, too wet or too thick. After sowing, the temperature of mushroom house should be controlled within 65438 08℃, and the sowing date can be postponed appropriately if necessary, which also has certain control effect.
(5) Once the disease occurs, stop spraying water on the bed surface immediately and increase the ventilation. When the soil surface is dry, pick the fruiting body of walnut fleshy miscellaneous bacteria, dig out the polluted culture material and soil cover, and spray the bed surface with 2% formaldehyde solution.