Chinese cabbage white spot disease mainly damages the leaves and is one of the major diseases of cabbage leaves. At the beginning of the disease, small brownish-brown spots appeared on the leaves and later expanded into round, near-circular, or ovoid lesions with pale yellow halos around the lesions. The outer edge of the lesion is dark green, but sometimes it is not obvious. The lesions were white at the end, translucent and roasted like fire. Sometimes the lesions break or fall off. In the late stages of the disease, they form into irregular, massive, dry dead spots. When the air is wet, gray molds often appear on the back of the lesion. Frequent downy mildew, and increase its harm. Therefore, the prevention and control measures taken are: 1. Selection of disease-resistant varieties. 2, a reasonable rotation. More than 3 years of rotation are performed on heavier plots perennially. 3, do a good job of seed disinfection. It can be soaked in warm water at 50°C for 15 minutes, allowed to dry after cooling, and can also be seeded with 0.4% thiram. 4. Strengthen field management. Choose land plots with high topography and well-drained land. Application of organic fertilizer after maturity, increased phosphorus, potassium fertilizer, improve plant disease resistance, so that reduce the incidence. Drain the water after the rain and remove the diseased leaves in time. After the harvest, remove the field sickness and plunge the soil. 5, pharmaceutical control. Available 70% mancozeb WP 500 times. Or spray with 64% antivirus WP 600 times. Spraying once every 10 days or so, even spraying 2 or 3 times, the effect is better.
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