洋芋环腐病是内蒙、甘肃等北方七个省区农作物的重要病害之一,严重威胁着洋芋的高产稳产。一九七三年,北方七个省区的农业科研部门专门对洋芋环腐病作了座谈讨论。一致认为感染环腐病的种薯播种后除个别感病较重的薯块出现烂薯缺苗、烂芽死苗现蒙外,一般田间植株上的主要症状是维管束遭受破坏、植株表现萎蔫。但不同地区不同品种也表现各种不同的并发症状。如有的 Cymbidium rot is one of the important diseases of crops in seven provinces and autonomous regions in the north of Inner Mongolia, Gansu and other regions, which seriously threatens the high and stable yield of potato. In 1973, agricultural research departments of the seven northern provinces and autonomous regions held a special discussion on potato ring rot diseases. Unanimously that the seedlings infected with ring rot disease except for some individual susceptible tuberous seedlings after emergence of potato seedlings, rotten buds appear outside, the main symptoms of the general field plants are vascular bundle damage, plant wilting . However, different breeds in different regions also show different kinds of complications. If any