   Sweet potato black spot disease is also called black shank disease. It may be infected in the storage period, the nursery period, and the growing season of the field, which is one of the main factors leading to the occurrence of rotten sputum in storage, rotten beds in the nursery period, and dead seedlings after planting. Black spot disease can be transmitted through multiple pathways such as diseased potato pieces, diseased seedlings, diseased soils, and fertilizers. Prevention and treatment of this disease should be taken in order to breed disease-free seed potatoes is based on robust disease-free seedling cultivation center, supplemented by a comprehensive prevention and treatment of chemical control measures.
   1. Strictly implement quarantine measures:
   It is forbidden to transport diseased potatoes and diseased seedlings, and it is found that diseased potatoes and diseased plants should be disposed of in time and must not be planted.
   Second, the establishment of disease-free seeding:
   The disease-free fields that have not been planted with sweet potatoes for more than 2 years are selected , and the seedlings that have not been diseased are planted and planted. If you do not have a net manure, you can apply cake fertilizer, fertilizer, and green manure.
   Third, seed potato, seedling disinfection treatment:
   The seed potato can be soaked with warm soup or selected with a medicament such as carbendazim or methyl thiophanate for disinfection. Seedlings can be disinfected with chemicals. The variety of the pesticide is the same as that of the seed potato, and the concentration can be about 1 times thinner than that of the seed soaking .
   Fourth, to avoid pollution of fertilizers and potato fields:
   Lose the opportunity to clean up the diseased potatoes and diseased seedlings in the fields and seedbeds, and avoid contaminating fertilizers and potato fields through various channels.
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