How to prevent cabbage black rot

Cabbage black rot is an important disease that damages cabbage. It can be attacked from the seedling stage to the bulbous stage. After harming the leaves and flower bulbs, the curd loses its commercial value, resulting in a reduction in yield and causing serious losses to the vegetable farmers. Therefore, it is imperative to prevent cabbage black rot in a timely manner so that early cure, minor cure and cure can be achieved.

Symptoms Identify black cabbage rot mainly damage leaves, leaf or bulbs. At the seedling stage, the cotyledons were immersed in water and quickly died or spread to true leaves. At the beginning of the disease, firstly, starting from the leaf margin, "V"-shaped brown spots appear at the tip of the leaf marginal veins, gradually covering the entire leaf margin to form a yellow-brown band. If 5-10 true leaves at the time of onset, the lowest leaf begins to wilt and turn yellow, and then the whole plant gradually withered; if it occurs in the rosette period, cabbage balls appear black spots, the ball is loose and loose, and it completely loses the value of the goods. . Once the disease occurs, the area of ​​infection is larger and the incidence is faster, which will result in serious reduction of production.

Occurrence of regular pathogens on the seed or with the disease in the soil in the winter, from the seedlings of the cotyledons or leaves of the leaves, from the water hole or wound invasion, and quickly into the vascular bundle caused by the base of the disease. Germs can spread through farm tools and rainwater. High temperature and high humidity, repeated cropping, poor soil drainage function, large amount of nitrogen fertilizer, organic fertilizer and potash fertilizer and trace elements zinc, manganese, molybdenum, etc., a small amount of application, soil microbial environment is unbalanced, are conducive to the survival and reproduction of bacteria.

Control methods (1) Agricultural control. Soaking in warm water at 50°C for 20-30 minutes, or soaking in 0.1% copper sulfate for 15 minutes. Severely affected plots and cruciferous vegetables have a 2-3 year rotation. Improve soil supply and drainage conditions, increase organic fertilizer, phosphorus and potassium fertilizers and trace fertilizers. (2) Chemical control. The seedbed was sterilized with 50% dexamethasone 800-1000 times spray wet soil or 50% carbendazim 800 times into the seedbed. At the beginning of the disease, use 14% solution of ammonia-copper water bath agent 600 times, or 77% copper hydroxide wettable powder 500 times, or 72% agricultural streptomycin soluble powder 5000 times, once every 7-10 days, even spray 2 -3 times.

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