With the adjustment of industrial structure, cabbage has become a major industry for vegetable cultivation, but the more serious the occurrence of various diseases, resulting in a 10% reduction in production. Cabbage downy mildew: from the seedling stage to the heart of the package are susceptible to disease, first appear pale green spots on the leaves, and gradually expanded to brown, brown after death. Control methods: Selection of varieties resistant to downy mildew such as: Tianjin Green 75, Beijing New 2nd, Beijing No. 80, No. 106 and so on. Seed Disinfection: Use 20% metalaxyl wettable powder 200 times the seed weight 0.3% seed weight before seeding, apply once a day for 7 days, and spray 2-3 times. Cabbage root tuber disease: seedlings or plants can be diseased, the diseased plant leaves pale, drooping, especially before and after the sunny day. The main roots, lateral roots, and fibrous roots of the diseased plants can all cause tumor damage. In the later stage of disease, the diseased parts are easily infested by the soft rot seedlings, resulting in tissue rot or collapse, and the odor causes the whole plant to die. Control methods: Implement a three-year rotation. Seedlings transplanted and transplanted are planted with disease-free soil or sterilized by pentachloronitrobenzene WP before sowing. With 50% thiophanate powder 1.5-3 kg per mu, 20-30 kg of fine soil, mix well after the application of furrows in the ridge. Or use 50% carbendazim WP 500 times to irrigate the roots and irrigate 250 ml per plant. Cabbage soft rot disease: from the continuation period to the heart of the package. Common three types: outer leaves are wilting, and during the rosette period, the vegetables are wilted at noon on sunny days, but the early pods are recovered. After a few days, the outer leaves of the diseased plants lay on the ground and must be exposed or the ball is exposed. The petiole, stem or rhizome of the stem The tissue rots, the pathogens invade through the wounds of the vegetable pods, and the diseased tissue is sticky, soft and rot-like. The pathogens are invaded by petiole or the edge of the outer leaf or the tip of the leaf ball, causing rot. Prevention methods to avoid continuous cropping. The appropriate sowing, the implementation of ribbon planting, to avoid man-made wounds such as fertilization and drug-making operations. Seed treatment: using Fengling or Nongken 751 seed dressing, due to the long period of infestation at the seedling stage, the infection site is more, prevention and control once in the seedlings and secondary Dingmiao. Chemicals control: 72% of agricultural streptomycin sulfate soluble powder 3000-4000 times, or 57.6% of the dry liquid granules of crown bacteria 1500 times; 20% of WP wettable powder 800 times, every 7 days, even Prevent 2-3 times. Bacterial keratoses: from the cabbage seedling stage to the rosette stage or the early stage of the package, the external 3-4 layers of leaves become acute-type onset after infection, and water-stained membrane-like rot appears. The diseased leaves are rust-colored or brownish-dry, and the posterior disease department Bursted, detached, perforated, remnant veins. The disease has become the most important seedling disease in the cabbage in our county. Control methods: spraying 72% of agricultural streptomycin sulfate 3000 times or 57.6% of bacteria dried 1500 times. Note: When the foliage is sprayed, the front and back sides of the blade should be sprayed; the vegetable ground should also be sprayed.
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