Mushroom growth "acne" what's going on?

Some friends of mushroom farmers report that they grow "acne" on the mushroom, that is, the mushroom cover is covered with small pimples, seriously affecting the quality of goods, difficult to sell, ask what to do? This symptom is "tumor cover disease". This kind of diseased mushroom is not caused by any bacteria, but a physiological reaction formed by the low temperature of its growing environment, just as when the temperature is too low, the human body gets goose bumps and sweat when the temperature is too high. It can be eaten as a normal mushroom, do not worry, but to a certain extent affect the commercial value of mushrooms. The main cause of Pleurotus ostreatus is that the temperature is too low. However, some mushroom farmers consulted: the temperature of the mushroom shed can reach 8 ℃, or even more than 10 ℃, why does this phenomenon still happen? It is understood that most mushroom farmers measure the temperature at noon, and the temperature measurement is mostly at a height of about 1.5 meters from the ground, rather than the ground temperature, which creates an illusion. As we all know, noon, especially around 2 o'clock in the afternoon, is the hottest time of the day, and temperature measurement at this time is biased. The correct method: one is to use the highest and lowest thermometer, which can display the maximum and minimum temperature of 24 hours a day, and the other is to measure around 2: 00 p. M. and 3: 00 a. M. respectively. the simple calculation method is to add and divide the data of the two temperature measurements to get the average temperature of the day. However, whether the average temperature is appropriate or not does not represent the lowest temperature that the mushroom can bear. In general, under the condition of low temperature in winter, the lower temperature that the mushroom can bear should be compared with the lowest temperature in the mushroom shed. If it exceeds the lower limit, tumor cover disease will occur. It should be said that in winter production, how to raise the temperature of the mushroom shed is the key to the occurrence of tumor cover disease, so what preventive measures should be taken? 1. The sun heats up. By removing the grass from 9: 00 a.m. to 3: 00 p.m., the greenhouse temperature can be increased by 5 ℃ ~ 10 ℃ by daylight, and even by 15 ℃ in fine, windless weather. However, as the ultraviolet light in the sun is easy to have a negative impact on the mycelium of Pleurotus ostreatus and its young mushrooms, a sunshade net or black plastic film should be pulled at the top of the shed to make the heat enter the shed and block the light. two。 Add a small arch shed. Mainly for border planting, the method is to set up a small arch shed on the fungus bed, cover it with black plastic film, and also remove the grass from 9: 00 a.m. to 3: 00 p.m., so that the temperature of the greenhouse rises rapidly. After covering the grass in the afternoon, all the small arch shed will be opened, one is to make it ventilated, the other is to make the heat uniform, stop for about an hour, cover the small arch shed to keep warm. 3. The coal stove heats up. The coal stove is installed in the sundries room outside the shed, and the fire wall is built with bricks and blanks in the middle of the shed or against the north wall instead of the chimney, so that the smoke is discharged from the other end of the shed, which can not only effectively increase the temperature of the shed, but also not affected by the weather. If it is combined with the first method, that is, the sun temperature increases in sunny days and the coal stove heats up in rainy and snowy days, the production effect of ensuring greenhouse temperature and saving fuel can be achieved. In addition, such as building the mushroom shed into a winter-warm greenhouse, or building a Huilong fire tunnel underground in the greenhouse, or installing soil heating, and so on, will be of great help to raise the temperature.