Downy mildew is one of the important diseases of cruciferous vegetables. In addition to damaging cabbage, the disease can also harm radishes, cabbage, rape, mustard, broccoli, and leeks. The disease is mainly harmful to the leaves. It was initially a pale yellow or yellow-green lesion. It was yellowish-brown in enlargement, polygonal or irregular in shape. When the air is wet, a white to grayish creamy mildew layer develops in the diseased part of the lobe. Occurrence characteristics: The pathogen is flagellin subflavus fungus. The climatic conditions have a great influence on the occurrence of the disease. Within the suitable temperature range, the greater the humidity, the heavier the disease; the continuous cropping aggravates the occurrence of diseases. Control methods: 1 selection of disease-resistant varieties. 2 Rotations with non-cruciferous crops, preferably with paddy crops. 3 Strengthen fertilizer and water management. 4 When the onset center was found, it was sprayed in time. The commonly used agents were: 58% metalaxyl Mn-Zn 500 times, 25% metalaxyl 800-1000 times and 75% chlorothalonil 600 times. China Agricultural Network Editor
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