在华北栽培马铃薯的地区基本上可分为晚熟种(包括中熟种)的一季作地区(北纬40°以北),马铃薯主要的病害为晚疫病;在北纬32°—40°之间尚有早熟种的两季作地区(包括隔季播种地区),本地区主要马铃薯病害是退化(包括马铃薯毒病)。这些病害不仅造成当代的食用薯的产量减低,而且也严重的影响着种用薯的价值,除了这些大面积发生的主要病害以 The area where potatoes are cultivated in North China can be basically divided into a single cropping area (north of latitude 40 ° north) with late-maturing species (including medium-maturing ones), and the main disease of potato is late blight. There is still between 32 ° -40 ° north latitude The precocious two-seasons (including seeding in the following season) are the major potato diseases in the region that degenerate (including potato virus disease). These diseases not only reduce the yield of contemporary edible potatoes, but also seriously affect the value of planting potatoes. In addition to these major diseases that occur on a large scale,