Causes and control of mycelial atrophy of volvariella volvacea
1. The use of inferior bacteria: the age is too long or too short, the strain degenerates, the mycelium is weak, the stress resistance is poor, or the strain is stored in an environment where the temperature is too low or too high for a long time, there will be the phenomenon of non-germination and mycelium shrinkage after sowing.
Prevention and treatment: select the right age, high-quality bacteria, and ensure that the temperature in the culture process is not too low.
two。 Improper control of culture material temperature: when the temperature is high, the culture material is thick, and the heat preservation performance of the mushroom room is good, the temperature in the culture material exceeds 42 ℃ for a long time after sowing, which will lead to mycelium shrinkage and death, resulting in burning bacteria; when the temperature is too low or the temperature difference between day and night is too large, it will also cause mycelium growth slow and shrinking. In general, the feed temperature during the mycelial growth period should not be lower than 30 ℃ and below 28 ℃, although the mycelium will grow, but the yield is not high and even does not produce mushrooms.
Prevention and treatment: after sowing, pay close attention to the temperature and material temperature in the mushroom room. If the temperature is too high, it should be ventilated and cooled down, and it can also be sprayed in space and water can be poured underground. When the temperature is low, it should be kept warm and heated in time.
3. Improper moisture control of culture material: when cultivating volvariella volvacea, abnormal mycelial growth caused by dry culture material was rare. But the water content is too high, more than 75%, or the film cover is too strict, the culture material is impermeable, and the ventilation condition of the mushroom room is not good, the hyphae will atrophy or autolysis due to hypoxia.
Prevention and treatment: culture material treatment according to the principle of dry rather than wet, spray "mushroom water" and then appropriately increase the amount of spraying water.
4. Improper water diversion: when transferring water, the water temperature is too low, the water flow is too strong, the amount of water is too large, the mushroom bud is too small, and the ventilation is not timely, resulting in mycelium atrophy and death.
Prevention and control: when transferring water, the water temperature must be above 25 ℃. If the material temperature is low, the water temperature should be above 30 ℃.
5. Miscellaneous bacteria and pest harm: competitive miscellaneous bacteria compete with straw mushroom hyphae for nutrition. Pests such as nematodes, mites and mushroom fly larvae will nibble up the hyphae and cause miscellaneous bacteria and virus infections, resulting in mycelium atrophy and death.
Prevention and control: the secondary fermentation should be thorough; kill the miscellaneous bacteria and pests in the mushroom room; select excellent bacteria; keep the environment around the mushroom house hygienic.
6. Drug damage: after sowing, some mushroom farmers produce heavy ammonia due to improper use of drugs, excessive concentration, excessive use and other improper operations, or spray containers that have not been washed clean, or excessive urea is added to the material, resulting in mycelium atrophy and death.
Anti-metallurgy: before using the medicine, be sure to prescribe the right medicine and read the instructions carefully; the container for spraying water must be used separately from the container for spraying pesticides.
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Distinguishing the advantages and disadvantages of volvariella volvacea
The quality of volvariella volvacea should be identified before cultivation, and high quality strains should be selected as far as possible. The appearance of high-quality bacteria is as follows: the hyphae are stout, the upper and lower hyphae develop uniformly, and the aerial hyphae are white or translucent. The specific identification methods are as follows: first, the bacteria used for cultivation are about 30 days old, the hyphae are thick and white, there are light brown chlamydospores on the hyphae, and the fragrance of straw mushroom can be smelled after pulling out the cotton plug. This kind of strain is a high-quality strain, which eats food quickly and grows vigorously after sowing. If there are few chlamydospores, the hyphae are still young and can continue to grow.
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What if the mycelium of volvariella volvacea grows
In the mycelium growth stage of volvariella volvacea, a large number of white fluffy aerial hyphae were formed on the material surface, or even grew into a layer of white quilt, resulting in delayed mushroom production and low yield, due to the high temperature in the haystack. Control method: after straw mushroom inoculation, the film should be ventilated regularly to reduce temperature and humidity, and the grass quilt should not be covered too thick to promote the mycelium to grow into the material.
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