Leek leukoplakia, also known as leek gray mold, is one of the main diseases of leek. The symptoms are: in the early stage of disease, small white spots or light grayish brown spots appear on the leaves, and then the tip develops downwards. When the humidity is high, the surface of the dead leaves is gray or green male villous. Or in the knife cut mouth rot down, first water stains, after the light green, and a brown ring pattern, lesions spread after most of the semi-circular, when the humidity is large gray brown or gray-green surface of the hair Mildew. The occurrence of leek white spot disease has the closest relationship with temperature and humidity. The temperature range for breeding and reproduction of germs is 15-30°C and the relative humidity is above 85%. The leek has poor disease resistance in the microclimate environment of the greenhouse, and the disease is severe, especially cold or hot, and it is subject to freezing at night, high temperature and high humidity during the day, and the air is not timely or the cold wind at the bottom of the canopy chamber can directly aggravate the disease. Prevention of leek white leaf blight disease method: First, temperature and humidity control. According to the weather conditions, a certain amount of shed film is opened at noon, and ventilation reduces the temperature and humidity. Apron at the bottom of the shed and no bottom wind is allowed. Through regulation, the maximum temperature in the shed is no more than 23°C, the temperature difference between day and night is no more than 10°C, and the relative humidity is kept below 75%. The second is to clear the booth. After each harvest of leeks, the diseased leaves and diseased plants are removed in time, and the diseased bodies are brought out of the shed to be buried or incinerated to prevent the spread of germs. The third is chemical control. At the beginning of the disease, 10% fast-king spirit smoke or 45% chlorothalonil smoke agent can be used, 250 grams per mu, spread 6-8 points, and smouldering with smoke for 3-4 hours. Or use 50% carbendazim 500 times solution or 50% fast keratin 1000 times solution before applying soil, spray about 45kg/mu. The sick plot should be sprayed 2-3 times. (Hubei Dangyang Agricultural 110 Service Center)
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