前几年,由于检疫制度的放松,新老品种交替种植,互相串换,导致洋芋环腐病在我省扩展蔓延。各地区均有不同程度的发生,一般发病株率为15—20％,严重者高达50％,全省每年因环腐病损失洋芋约达二十至二十五亿斤。几年来,我们和贫下中农一起大力开展防治 A few years ago, due to the relaxation of the quarantine system, new and old varieties were alternately planted and exchanged with each other, resulting in the expansion of potato ring rot in our province. All regions have different degrees of occurrence, the general incidence of plant strains of 15-20%, up to 50% of serious cases, the annual loss of potato due to cirrhosis in the province about 20-2.5 billion kg. In the past few years, we have vigorously carried out prevention and control together with poor and middle peasants