Recently, some farmers’ friends have reported that they have grown acne on the oyster mushroom they planted, that is, the oyster mushroom mushroom cover is covered with small gingivae, which seriously affects the quality of the product and is not good for sale. What to do? This symptom is "cancer disease". This kind of diseased mushroom is not caused by any pathogen infection, but because of the physiological reaction caused by the low temperature of its growth environment. Just as the temperature is too low, the human body has goose bumps, the temperature is too high and sweating is a reason. It can be eaten as a normal mushroom without worrying about it, but it will affect the commodity value of the mushroom to a certain extent. The cause of the occurrence of the diseased mushroom is mainly due to the low temperature. However, some farmers consultation said: Mushroom temperature can reach 8 °C, or even 10 °C above, why does this happen? It is understood that most mushroom farmers measure temperature at noon, and the temperature measurement position is mostly about 1.5 meters above the ground, rather than the ground temperature, which creates an illusion. As we all know, at noon, especially around 2 pm, it is the highest temperature period in the day. At this time, temperature measurement is biased. The correct method is to use the highest and lowest thermometers to display the maximum and minimum temperatures for 24 hours a day. The second is to measure at 2 pm and 3 am respectively. The simple calculation method is to measure the temperature twice. Adding two to the data, you can get the average temperature of the day. However, whether the average temperature is appropriate or not does not mean that the mushroom can withstand the lowest temperature. Generally, under the condition of low temperature in winter, the lower temperature limit of the mushroom should be compared with the lowest temperature in the mushroom shed, if it exceeds its lower limit. , it will certainly happen tumor disease. It should be said that in the winter production, how to raise the temperature of the mushroom shed is the key to the occurrence of angioma disease. So, what preventive measures should be taken? 1. Daylight warms up. To remove the grasshopper after 9:00 am and before 3 pm, use the method of increasing the temperature of the sun, which generally can increase the temperature of the greenhouse by 5°C to 10°C. It is very sunny and weatherless, and it can even increase about 15°C. However, due to the fact that ultraviolet rays in sunlight are liable to have a negative impact on the mushroom mycelium and its young mushrooms, a layer of shade net or black plastic film should be pulled over the shed to allow heat to enter the shed and block the light. 2. Add a small shed. The main method for the planting method is to set up a small shed on the fungus, cover with a black plastic film, and also remove the grasshopper after 9:00 am to 3:00 pm, so that the temperature of the shed quickly rises. After covering the haystacks in the afternoon, all the small arches were uncovered, one was ventilated, the other was uniform, and the heat was kept for an hour or so. 3. The coal stove heats up. Install coal stoves in the utility room outside the shed. Put the fire wall in the middle of the shed or in the middle of the shed or brick to replace the chimney, so that the flue gas can be discharged from the other end of the shed, which can effectively increase the temperature of the shed. It is also not affected by the weather. If it is combined with the first method, that is, sunny daylight increases the temperature of the coal in the rain and snow cloudy days, then both the temperature of the greenhouse and the fuel saving effect of the best of both worlds can be received. In addition, if the mushroom shed is built into a winter-warm greenhouse, or a backfire fireway is built underground in the shed, or soil heating is added, it will greatly help increase the temperature.