Chinese cabbage soft rot commonly known as "grub", occurred in the Chinese cabbage cabbage, began to produce water-stained lesions on the base or short-cut stems of the vegetables, and expanded from the outside to the inside; sometimes short-cut stem rot after Expand inside out. At the early stage of disease, the outer leaves are wilting, but early and late can still return to normal. Later, with the development of the disease, the outer leaves are drooping, the leaves are bare, and the base is rotted, giving off a foul odor, and the whole plant dies when severe.
Control methods: (1) Strengthen management. Early prevention and control of underground pests in a timely manner, timely prevention of fleas, cabbage caterpillars, and diamondback moths from the seedling stage; cultivator (especially at the end of rosette) should be shallow so as not to damage the roots, and at the same time, not to injure the shoots; fertilization should be uniform. Pay attention to the location and concentration of fertilization and avoid rot and burnt leaves. (2) Remove diseased plants. After entering the ball stage, pay attention to constantly observe field plants. Once the diseased plant is found, remove it deeply and use hydrated lime to spread around the diseased hole to prevent the spread of germs. (3) Reasonable irrigation and drainage. Drought should not be flooded with water, nor should local water, in order to facilitate the healthy growth of plants, improve disease resistance, to prevent the spread of pathogenic bacteria in the field; timely elimination of stagnant water after the rain. (4) Chemical control. In the cabbage seedling stage or the early stage of disease, the use of Fengning 200 grams per mu, spraying 50 kilograms of water, control effect is very significant. In addition, the spraying of 50% dexamethasone 600-800 times solution, enemy crude powder 500-1000 times or 200 units of agricultural streptomycin, etc., have a certain effect. When a large number of diseased plants occur in the late stage of Chinese cabbage growth or in the field, 500 grams of vegetable Fengning per acre and 100 kg of water are planted on a per plant basis. The results are good.
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