After the promotion of the new potato varieties, with the increase of planting years, the yield decreased year by year, the plants became shorter, the tubers became smaller, and the stem and leaf abnormalities were accompanied by such phenomena as flower leaves and leaf curling or shrinkage. This phenomenon is called the degradation of potatoes.
The direct external cause of potato degeneration is virus damage. The virus infects plants through mechanical friction, aphids, leafhoppers, or soil nematodes, causing them to degenerate. High temperature is an indirect external cause of potato degradation. The cultivation of potato under high temperature has weakened growth and decreased disease resistance. And high temperature is conducive to virus reproduction, infestation and spread in the plant body, thus exacerbating the harm of the virus and aggravating the degradation. The internal cause of potato degeneration is variety antiviral ability. The varieties with strong disease resistance are lighter in incidence and less serious in degradation. The varieties with weak disease resistance are heavy and the degradation is serious.
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