Now, it has entered the critical period of winter shed leeks management. But recently, when we enter some leeks in the town of Hujiabu, Laoting County, we see rotten yellow leaves. These yellow leaves are the ones closest to the roots, and even more powerful leeks are rotten. Only one bald stalk is left, which is a headache. This leek has got an epidemic. The roots, stems, leaves and buds of leeks can all be harmed. When the humidity is high, white sparse moldy layer appears in the diseased part. The pathogenic spores overwinter in the soil with the diseased body, and when the conditions are appropriate in the second year, they are spread by wind, rain, and water. High temperature and high humidity are important conditions for the occurrence and prevalence of the disease. Control measures: To strengthen the cultivation and management. After watering and rainfall, the furrows should be raked and loosened to prevent lodging of weeds, weeds, and rot. Protected cultivation should be promptly ventilated and drained. Severely affected plots should be rotated 2-3 years with non-onion and garlic vegetables. Chemicals can be sprayed with 72% Kelu WP 700 times, 72% Plexco 600 times, 58% metalaxyl MnZn wettable powder 400-500 times or 60% MDF 600 times. Spray once every 7-10 days, and use the medicine alternately 2-3 times. Last year, our leeks also suffered from this disease. Some vegetable farmers played a bactericidal drug. Later, as the temperature became lower and lower, the disease was better. Some people did not even fight bactericidal drugs. . This year, due to the high temperature and high humidity, the disease is more severe than last year. If you continue the high temperature, you need to fight more drugs. Some farmers see the yellow leaves always think that insects bite, but do not think so, the general insect bite on the leaves there will be worms, and the occurrence of disease on the leaves of leek yellow leaves no trace, but rotten. Farmers can put some insecticides when fighting drugs to prevent them in advance.
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