Sweet potato black spot, also known as black shank, is a major disease on sweet potato. The disease is caused by a fungus infestation. The borne tubers or seedlings and diseased bodies and pathogens in the soil are the main source of the primary infection of the disease. Seedlings were transplanted to Daejeon, causing the disease in Daejeon. Therefore, the disease prevention and control measures are mainly to prevent seed and seedlings from carrying bacteria and to cultivate disease-free strong seedlings. First, the establishment of disease-free seedlings, the cultivation of disease-free strong seedlings 1, in a new field or after more than three years of rotation or rice fields for farming. 2. Choose fresh, skinless, non-injury wounds and non-freezing potato chips as seed potatoes. 3, seed potato disinfection. A 2% antibacterial agent "401" solution or a 70% thiophanate-methyl 1000 time solution may be immersed for 10 minutes or the seed potato may be placed in a bamboo basket and immersed in warm water at 55 degrees Celsius for 10 minutes. Second, the implementation of high cut seedling reproduction. Use potato chips to raise seedlings. When the seedling height is about 30 cm, cut it at a height of 7 to 8 cm above the ground and insert it into a disease-free plot to reproduce. When the seedlings to be grown are about 35 centimeters long, they can be cut and inserted at Daejeon at a distance of 10 to 12 centimeters from the ground, which can reduce the direct seeding of the seedlings to the field. Third, the implementation of crop rotation, in more than three years of rotation in the severely affected area, the best control effect.
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