How to Prevent Black Spot Disease in Chinese Cabbage
Cabbage black spot, also known as black mold, is a common leaf disease that can cause 5%-10% reduction in production when a rainy year occurs. In recent years, the incidence of the disease has increased year by year, and it is hoped that the farmers will pay more attention to it.
First, the symptoms
Black spot disease is most severe in the external leaves of Chinese cabbage, followed by the globules, the lightest leaves, and the early and early stages of the lower leaves. The lesions on the leaves are round, brown or dark brown, with concentric concentric bands, sometimes with yellow halos around the periphery, perforation of the diseased part under conditions of high temperature and high humidity, severe onset, half leaves or whole leaves withered. The lesions on the petiole were longitudinal strips, dark brown, slightly sunken, and black moldy on the lesions when wet.
Second, the law of occurrence and epidemic conditions
The occurrence of black spot disease is related to climatic conditions, disease resistance of the varieties, and cultivation and management. The degree of mutual coordination plays a decisive role in disease epidemics. High temperature and high humidity are conducive to the occurrence of diseases. Under conditions of suitable temperature of about 17°C, continuous rain or heavy fog, it is easy to become a disaster. It can be seen that high humidity, rain, and low temperature are key factors in the pathogenesis. The incidence and cultivation conditions are related, if sown early, high density, low-lying terrain, extensive management, lack of water, lack of fertilizer, plant growth is poor, disease resistance is weak, the general incidence of weight.
Third, control methods
1. Strengthen field management. When the seedlings are seeded in a timely manner, they are weak and strong, they stay small, and finally they choose a robust seedling. According to the growth needs of Chinese cabbage, formula fertilization, apply more mature organic fertilizer, and increase phosphorus and potassium fertilizer. Rational irrigation, seedling water irrigation, adequate control of water during the rosette period, adequate water and fertilizer supply during the filling period. After the Chinese cabbage is harvested, it is timely to remove the pastoral disease and bring it out of the field to be buried or burned to reduce the source of the disease in the field.
2. Chemical control. When a central diseased plant emerges, it is immediately treated with medication, once in 7-10 days, for a total of 2-3 times, to control the occurrence of melasma. The agents used are: 50% acetaminophen wettable powder 1000 times, 75% chlorothalonil wettable powder 600 times, 70% mancozeb WP wet 600 times, 64% antivirus WP 500 times Liquid, 10% difenoconazole water dispersible granules 1000 times + 75% chlorothalonil wettable powder 600-800 times liquid.
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