Beijing Plant Protection Station technicians discovered sweet potato virus disease when conducting a general survey of pests and diseases in the sweet potato growing area in the suburbs of Beijing. According to the detection, the viruses invading sweet potato and sweet potato in the seedling stage were sweet potato leafroll virus, sweet potato plume mottle virus and sweet potato virus G. Symptoms were mainly leaf upturns, chlorotic spots or purple feathers along the veins. Plant dwarfing and so on. There are many types of viruses that infect sweet potato, and the symptoms caused are generally divided into 6 categories:
Leaf chlorotic spot type
Both seedling and field can occur. Symptoms of the initial sensation of the Ming dynasty were slight chlorotic translucent patches. Afterwards, the surrounding areas became purple-brown and formed purple ring spots. Some cultivars developed into yellow spots and even formed blemishes. Some varieties developed typical plume purple along the veins. Stripes. A few varieties always form only bleak spots, and new leaves that grow in the hot season show fewer spots.
Leaf type
The veins of the early stage were reticularly transparent, with irregular yellow-green leaves and stripes on the posterior leaf veins.
Wrap type
Rolled on the edge of the blade, severe cup shape.
Leaf shrinkage type
The diseased seedlings have fewer leaves and shrunk, and the leaf margins are not neat or even distorted, with chlorotic spots parallel to the midrib.
Yellow leaf type
Young leaves yellow or reticulate yellow veins, veins and branch veins become reticulate yellow veins.
Cracked potato chips
Dark brown and yellow-brown turtle cracks appear on the tubers.
If the sweet potato shows the above symptoms, it should cause the potato farmers' attention.
At present, there is no specific agent for controlling sweet potato virus disease, and the application of virus-free vaccine is the most effective method. By increasing the organic fertilizer and strengthening the field management, the growth of the potato seedlings can be promoted and the disease resistance can be enhanced. Once the diseased plant is found, it is immediately removed to stop the spread of the virus disease. At the same time, use 25% buprofezin WP or 3% acetamiprid microemulsion to control Bemisia tabaci and aphids to minimize re-infection of sweet potato virus disease.
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