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马铃薯具有高产、适应性强、生育期短、耕作简单等优点,是粮菜兼用作物,对调节蔬菜供应淡季起着重要的补充作用,更是我市农民的主导产业。一个优良马铃薯品种种植几年后,薯块变小、品质变劣,叶片卷曲皱缩,植株畸形,茎秆细弱,产量逐年呈下降趋势,品种种性出现退化。发病率上升,3～5年内就达到100%,
Potato has the advantages of high yield, strong adaptability, short growth period and simple tillage. It is an important complement to the off-season of vegetable supply. It is also the leading industry of peasants in our city. A few years after the planting of a good potato variety, the tuber becomes smaller, the quality deteriorates, the leaves curl and shrink, the plant deformity, the stem is weak, the output declines year by year, and the variety degenerates. The incidence increased from 3 to 5 years to reach 100%