Occurrence and Control of Black Rot in Chinese Cabbage

Chinese name: Cabbage black rot disease Chinese alias: Half-legged Latin scientific name: Xanthomonas campestris pv. Campestris (Pammel) Dowson Damage crops: cabbage, broccoli, indigo, Chinese cabbage, radish, rape, etc., continue to damage the storage period, one of the major diseases in the production of Chinese cabbage. Symptoms of Injury: Seedlings cannot be unearthed before they are unearthed, or they die when they are unearthed. In the adult stage, leaf lesions mostly develop from the leaf margin inward, forming a "V"-shaped yellowish-brown spot, with a yellowish light around the lesion. The pathogen invades from the stomata and forms an irregular tawny disease on the leaves. Spots, sometimes lesions develop into reticular veins along the veins, ribs appear pale brown in the leaves, the diseased part is dry rot, the leaves twist to one side, the leaves or plants on the sides are yellow, and some of the outer leaves are dry and fall off. When the plants fall down, when the humidity is high, the diseased department produces tan-brown bacteria or oil-immersed wet rot. After drying, it looks like transparent thin paper. The stem base rots and the plants wilted. The onset of the strains, the loss of leaves, dark brown buds of the calyx, and finally dead, leaf lesions "V" shape. Black rot disease odorless, moldy dry, can be distinguished from soft rot. Chinese cabbage, which is damaged by black rot, is vulnerable to soft rot pathogens, which increases the degree of damage to cabbage. The morphological characteristics of pathogens: rod-shaped bacteria, a flagellum at the top of a flagellum, can be chained, Gram negative. The growth temperature of the bacteria ranged from 5 to 39°C, the optimum temperature was 25 to 30°C, and the lethal temperature was 51°C for 10 minutes. The optimum pH was 6.4. The bacteria can generally survive for 2-3 years on the sick and sick. Classification Attributes: Xanthomonas campestris, wild rape, black rot Pathogenic type Distribution area: Occurred in all parts of the country Characteristics of the disease: The pathogens wintered in the soil with seeds, strains, or diseased bodies, becoming the first year of the second year of invasion. Dye source. Sick seeds are sown. The pathogens invade from the water hole at the edge of the seedlings' cotyledons and cause disease. The pathogens in the soil are spread by rainwater, irrigation water, agricultural operations, and insects. The pathogens invade from the leaf margin water hole or insect bite wound. Diseased seed strains enter the seed pods and seed coats to make the seeds diseased and the seed morbidity rate can be as high as 100%. Sick seeds are the main route for the long-distance spread of black rot. High temperature, rainy, early sowing, continuous cropping with cruciferous crops, management of extensive, serious pests, heavy disease. Control methods: (1) Seed-free strains and seed-sterilized disease-free strains were collected and the seeds were disease-free. Non-viable strains can be seeded, seeds can be soaked for 20 minutes with 200-400 times solution of 45% Daisen ammonium hydroxide solution, washed and dried, or soaked in warm water at 50°C for 20 minutes, cooled with cold water, or used with a seed weight of 0.3%. 50% thiram wettable powder dressing. Be careful not to use streptomycin to soak seeds, so as to avoid phytotoxicity. (2) Crop rotation and non-cruciferous crop rotations are carried out for 2 to 3 years. (3) Strengthen field management timely planting, timely watering seedlings, reasonable seedlings, timely removal of diseased plants in the field and bring deep burial outside the field, and lime disinfect the diseased hole. (4) Chemical control at the early stage of onset of the disease, spraying in time, control of agricultural streptomycin or neophytin 4000 times or 47% of Garnett's WP 600-800 times or 70% of Dixon's soluble powder 1000 times Liquid spray, or vegetable Fengning B1 300 grams per 667 square meters plus 60 liters of water spray or add 250 liters of water irrigation root.

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Cosmetic Raw Materials

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