The three major diseases of sweet potato are stem nematode disease, root rot, and black spot disease. No matter which kind of serious diseases occur, these three diseases can cause the sweet potato to fail its production and seriously affect the economic benefits of the potato farmers. At present, there are few varieties that are immune to production. The main control methods are: 1. Strict plant quarantine. It is forbidden to transfer seed and seedlings from the ward. Establish disease-free farmland breeding. Select disease resistant varieties. 2, rotation down. Generally, it will fall once every 3 years, and it will not be less than 3 years. Establish disease-free fields. It can be used to rotate crops such as sesame, cotton, corn and millet. Do not simmer with onions, garlic, or potatoes. 4, high cut seedlings, cut root disease can effectively prevent the occurrence of diseases. 5, the agent soaked seedlings. Use 50% phoxim EC or 40% methylisophos- phorus emulsion for 100 minutes to prevent stem nematode disease; use 50% thiophanate-methyl WP 500-700 times or 50% carbendazim 2500 -3000 times fluid root can prevent black spot. 6, field application. For the application of pesticides before ridging the diseased land, or when planting seedlings during transplanting, disease prevention can be prevented.
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