The black spot virus is not easy to be destroyed and killed by high temperature, which can easily cause poisoning, fever, nausea, vomiting, diarrhea and a series of symptoms of poisoning, and can even lead to death.

Sweet potatoes are also known as sweet storage, sweet potatoes, Zhu yam, golden potatoes, Fan Ru, red yam, yucca potatoes, yams, yams, sweet potatoes, sweet potatoes, sweet potatoes, sweet potatoes, sweet potatoes, white potatoes, a goose, Moe sweet potatoes. Annual herbaceous plant, underground part with rounded, oval or fusiform tuberous roots, the shape, skin color and flesh color of the tuberous roots vary according to varieties or soils. Leaf blade shape, color often varies according to varieties, also sometimes on the same plant with different leaf shape, usually broadly ovate, petiole length varies, cymes axillary, bracts are small, lanceolate, flowering habit varies according to varieties and growing conditions, capsule ovate or oblate, seeds 1-4, usually 2, glabrous.

Cassava is native to South America and the Greater and Lesser Antilles, and is widely cultivated in tropical and subtropical regions around the world.

Sweet potato is a high-yield and adaptable food crops, and industrial and agricultural production and people's lives are closely related. In addition to the tuber for staple food, but also food processing, starch and alcohol manufacturing industry is an important raw material, roots, stems and leaves are excellent feed.