Cold gray shed Botrytis cinerea usually begins in December, with the growth and development of leeks, the condition gradually worsens, can be extended to the end of April in the coming year, winter and spring is the main disease of cold shed leeks, vegetable farmers must pay attention. First, the symptoms At the beginning, white to pale gray spots appear on the leaves, which are then expanded into elliptical or fusiform shapes. The late lesions often combine to produce large dead-blight spots, causing half leaves or whole leaves to die. When the humidity is high, the surface of the diseased area is covered with brown-brown mildew. The diseased leaves are often accompanied by musty taste, which reduces the quality. In the course of storage and transport of some leeks, the diseased leaves exhibit wet rot symptoms, completely wet and rot, and produce gray mold on the surface. Second, the incidence conditions Low temperature, high humidity and lack of light are the main conditions for the occurrence of gray mold. The temperature is in the range of 15°C-21°C and the relative humidity of the air is above 85%. The disease is easy to spread. When the temperature in the shed is high and low for several consecutive days, the resistance of the leeks can be reduced and the incidence of disease is heavy. Nitrogen fertilizer and phosphorus and potassium fertilizers are excessive. Insufficient and uncoordinated leek fields are prone to disease; fields with poor management, weak amaranth growing, and poor resistance to disease are also prone to disease; long-term continuous cropping is conducive to the accumulation of pathogens and the onset is serious. Third, comprehensive prevention 1. Increase farm manure and phosphorus and potassium fertilizers. The production of leeks requires sufficient nitrogen fertilizer to produce high yields. Therefore, many vegetable farmers often use large amounts of nitrogen-containing urea and ammonium nitrate. Practice has proved that a large number of single application of nitrogen fertilizer is also an important condition for the initiation of gray mold. Therefore, in the application of nitrogen fertilizer, it should be combined with phosphorus and potassium fertilizers. For example, 5000 kg of compost organic fertilizer, 15-20 kg of diammonium, 20-25 kg of potassium sulfate (or 50 kg of plant ash) per mu, which is the material basis for prevention of gray mold and high yield. 2. Control temperature and humidity. According to the weather conditions, some sheds were opened at noon for ventilation cooling and dehumidification. Through regulation of air release, the maximum temperature in the shed is not to exceed 25°C, the temperature difference between day and night does not exceed 10°C, and the relative humidity in the shed is controlled below 70%. Note that an apron should be added to the bottom of the shed and it is forbidden to vent from the bottom. After each harvest, carry out 2-3 shallow cultivating soils to reduce the humidity in the shed. 3. Clean up old leaves. Every time harvesting leeks, all the cut-outs should be brought out of the shed, and then the bundles should be cleaned and bundled. For the cleaned-up leaves and old leaves, they should be buried deeply. 4. The rotation is down. Severe disease fields should be rotated for 2-3 years with cruciferous and gourd vegetables and must not be rotated with onions or garlic. 5. Strengthen insulation and prevent freezing damage. Botrytis cinerea is easily invaded by wounds. When the temperature is lower than 0°C, the leaves of leeks can cause frostbite after frostbite. Therefore, when the temperature in the shed is close to 0°C, a small plastic shed can temporarily be buckled on the ridge to increase the temperature by 3°C-5°C, which has a good antifreeze effect, which can reduce the occurrence of gray mold. 6. Drug control. Spray precautions are taken after each harvest. The agent can be used 50% fast-king WP 1200 times, 50% acetaminophen WP 1000 times, 50% carbendazim WP 600 times, etc., and sprayed every 7-10 days. Even spray 2-3 times, the control effect is better. In the early stage of disease, 10% quick-kerose smoke or 45% chlorothalonil smoke agent is used to control tobacco smoke. 250-300 grams of smoke agent per acre is used to disperse 8-10 points, and smoke is smouldered with 3-4 flames. Hours, the control effect is obvious. 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