Reason: 1. The air is too dry. 2. After the primordium is formed, the temperature suddenly rises, resulting in continuous high temperature or temperature decrease, which stops the stalk from delivering nutrients to the cap, and the mushroom buds gradually wither and die. 3. Excessive humidity or direct spraying of water on the mushroom body makes the mushroom buds suffocate due to lack of oxygen.

Countermeasures: 1. After the mushroom bud is formed, we should pay close attention to the water content of the culture medium. When the water is insufficient, it should be irrigated to the surrounding ditches to make the water surface flush with the cultivation bed surface. For bag cultivation, nutrient solution can be directly injected into the material. The preparation method of the nutrient solution is: 50 kg of water, 125 g of urea, 45 g of potassium dihydrogen phosphate and 500 g of white sugar are evenly mixed. The amount of nutrient solution added is such that the weight of the whole bag is the same as that of the bag when the materials are thoroughly consumed. When planting by mud wall method, 2 cm deep nutrient solution should be poured into the top ditch of the wall. 2. After mushroom bud differentiation, attention should be paid to keeping the temperature of mushroom house stable, and timely ventilation to cool down or keep warm. 3. Deep ditches should be opened around the cultivation site to prevent water accumulation in the mushroom bed. In the process of replenishing water, it is forbidden to water mushrooms directly.

Second, the death of young mushrooms

Reason: 1. The strain is too old and the amount of seeds is too large. A large number of buds appear when the mycelium is not full or grows through the culture medium. Because the mycelium in the culture medium has not yet reached physiological maturity, the young mushrooms can not get nutritional supply when they die. 2. There are too many mushrooms on the surface of the material, which leads to insufficient nutrition of the population and the death of young mushrooms. The remarkable feature of this dead mushroom is that a large number of young mushrooms die. 3. When harvesting mature fruiting bodies, young mushrooms on the bed surface are damaged by vibration and collision, resulting in death. 4. Death caused by pests and diseases. Explain that the small mushrooms are yellow or brown and soft, and finally dry up; When the humidity is high, it looks like water stains, and it is sticky to touch mushrooms with your hands. Looking at the culture, you can see active mushrooms, flies, mites and so on.

Countermeasures: 1. Avoid using strains with too old bacteria in production. When coral-like fruiting bodies appear above the culture medium or grow out of the gap in the bottle cap, it means that the fungus is too old and should be restricted. When a small amount of yellow water accumulates at the bottom of the bottle, it has no use value. The optimum dosage of bacteria is 4% ~ 12% of the cultivation material, and it is forbidden to blindly increase the dosage of seeds. 2. When there are too many young mushrooms on the surface of the material, some young mushrooms can be removed manually to reduce nutrient consumption. You can also spray the culture medium with 400 times of compound sodium humate solution for animals, or use 5 g of Bijiu (B9), 20 g of magnesium sulfate, 5 g of boric acid, 0/0 g of zinc sulfate/kloc-,0/250 mg of vitamin B6b/kloc-and 20 g of urea to make a compound nutrient solution of 50 kg of water to supplement nutrition and promote the rapid expansion of fruiting bodies. 3. When harvesting mature fruiting bodies, the action should be light, and a sharp knife should be used to cut along the roots of the fruiting bodies to avoid vibration and injury to young mushrooms. 4. Before the mushroom shed is put into use, it is necessary to do a good job in pest control and disinfection of the site to kill mushroom flies and miscellaneous bacteria. Every cubic meter is fumigated with sulfur 10 ~ 12g, formaldehyde 8 ~ 10ml and dichlorvos 1 ~ 2mg for 24 hours, and fumigated for 2 ~ 3 times. Around the old mushroom house, lime water is needed to brush it. This can basically ensure that no serious diseases occur in the whole breeding cycle. If pests such as mushroom flies occur during the fruiting period, directly inject 3000 times of mushroom insect nets for seedbed cultivation into the material, and inject 2.5 ~ 5 kilograms of chemicals into every 50 kilograms of culture material, but be careful not to accumulate water in the seedbed for a long time. Wall-type bag culture, 3000 times of mushroom insect net liquid is poured into the bag for soaking 1 day, and the redundant liquid medicine is poured out the next day, and it is continuously treated twice.

Third, the mushroom is dead.

Reason: 1. The environment is too closed and the concentration of carbon dioxide is too high, which leads to the death of giant mushroom. Its remarkable feature is that some mushrooms first deform and then turn yellow and die. 2. pests and diseases.

Countermeasures: 1. Strengthen ventilation, especially in the mushroom growing stage, and several small windows can be opened around the mushroom shed. When cultivating Pleurotus ostreatus in winter, you can open the small window for ventilation every morning 10 and finish at 2 pm, but be careful not to let the wind blow the fruiting body directly. 2. At the early stage of pest occurrence, 2000 times of 1.8% avermectin EC can be sprayed for control.