Radish black rot is commonly known as black heart, rotten heart, the disease is caused by bacteria. Mainly harmful to leaves and roots. In the seedling stage, the cotyledons are water-soaked, and the root marrow becomes black and rot. In the pathogenesis of the leaves, yellow spots appear in many parts of the leaf margin, and the "V" shape develops inward afterwards. The veins become black and reticulated, and gradually the whole leaves turn yellow and dry. Black rot is widely distributed in various radish producing areas in the country, and it is more common. The protected areas and open fields can be affected, and the incidence is heavier in summer and autumn.
Radish black rot disease picture
Radish black rot can lead to severe production cuts, generally reducing production by 20% to 50%, and reducing production by more than 60% in severely ill years. The leaves of radish black rot are damaged, the leaf edge produces "V", the type of lesions, gray to light brown, the edge often has a yellow halo, and the veins are necrotic and black. The rhizome is damaged, part of the epidermis becomes black, or does not change color, the internal tissue is dry and rotted, the vascular bundle becomes black, and the pith tissue is also black dry and rot, even hollow.
Apply decomposed farmyard manure. Sowing at the right time and rationally planting it. Control pests in time and reduce the transmission of mediators. Rational irrigation, timely drainage after rain, reducing field humidity. Reduce wounds caused by farming operations. After the end of the cultivation season, the diseased body is removed in time and turned deep after the autumn.
Seed treatment. Before sowing, 30% succinic acid copper WP WP 600-700 times solution, 72% agricultural streptomycin sulphate soluble powder 1000 times solution can be used for 15-20 minutes, then washed with water, dried and sown.
Radish black rot agricultural control points
Before or after the harvest, remove the weeds and crop residues in the field and surrounding areas, burned or fattened intensively; deepen the cockroaches, promote the decomposition of the diseased bodies, reduce pathogens and worms. And non-undergraduate crop rotation, water and drought rotation is best. For disease-resistant varieties, use disease-free, coated seeds. If uncoated, the seeds must be sterilized with seed dressing or soaking agents.
After sowing, it is covered with medicinal soil, and it is easy to treat the area. Spraying a deworming sterilizing agent before the seedlings are sealed is the key to disease prevention. Early sowing, early seedlings, early soil cultivation, early fertilization, timely cultivation of soil, cultivation of strong seedlings. Choose the convenient irrigation and drainage field, open the drainage ditch, reduce the groundwater level, reach the rain stop without water; clear the ditch system after the heavy rain to prevent moisture retention and reduce the humidity in the field, which is an important measure for disease prevention.
A field with many soil pathogens or serious underground pests, which is applied or sterilized before being planted. The compost or the decomposed organic fertilizer prepared by the enzyme bacteria is not used, and the applied organic fertilizer must not contain plant disease residues. The use of soil testing and formula fertilization technology, appropriate application of phosphorus and potassium fertilizer, strengthen field management, cultivate strong seedlings, enhance plant disease resistance, and help reduce disease.
Timely control of yellow strips, mites and other pests, reduce plant wounds, reduce the path of pathogens; remove diseased leaves and diseased plants in time, and bring out burned fields, application of points or quicklime. Scientific irrigation should be carried out during high temperature and drought to increase the humidity in the field and reduce the damage and transmission of mites. Continuous irrigation and flooding are strictly prohibited.
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