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Symptoms: Mainly endangering the leaves. When the disease occurs, the leaves are scattered with many gray-white and nearly round lesions. The center has 1 or 2 irregular shaped wheel patterns, and the periphery has a pale yellow halo. The outer edge of the leaf back lesion is dark green, but sometimes it is not obvious. The lesion is finally white, translucent, and looks like a fire. Sometimes the lesions rupture or fall off. In the late stage of the disease, it is connected into irregular large dead spots. When the air is wet, gray mold is often produced on the back of the lesion.
Control methods First, the selection of disease-resistant varieties: such as Beijing Xiaoqingkou, Daqingkou, Liaobai No. 1, Shuxin Qingbaikou and Yuqing and other varieties are more resistant to disease.
Second, do a good job in seed treatment: seed dressing with 75% chlorothalonil or 50% Fumei double wettable powder, the dose is 0.4% of the seed weight; seed dressing with 50% chlorhexidine WP, the dose is The seed weight is 0.2% to 0.3%.
Third, strengthen cultivation management: the heavy disease area is implemented with non-cruciferous vegetables for 2 to 3 years. Leveling the land, adding base fertilizer, planting in a timely manner, preventing water accumulation in the field, clearing the leaves left in the field after harvesting, and ploughing into the soil, reducing pathogens, cultivating strong plants, and reducing the incidence.
IV. Implementation of chemical control: When there is sporadic disease in the field, the following pesticides should be sprayed: 50% carbendazim WP 500 times, 400% carbendazim suspension 800 times, 75% methyl Tobuzun WP 800 times solution, 70% mancozeb WP 500 times solution. In the case of the simultaneous occurrence of downy mildew and leukoplakia, 40% Ethylphosphorus aluminum wettable powder 300 times solution can be mixed in the carbendazim solution. Spray once every 10 days or so and spray 2 or 3 times.
Prevention and treatment of Chinese cabbage white spot disease
White spot disease seriously harms cruciferous vegetables, which not only causes loss of yield, but also affects the quality and storage of vegetables. Mainly infringe on Chinese cabbage, cabbage, rapeseed, turnip, radish, celery and snow scorpion, etc., of which Chinese cabbage is more serious. This disease is often complicated by downy mildew and aggravates its harmfulness.
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