引言我省南部地区马铃薯的退化是比较严重的。现时栽培的“男爵”品种,自北部地区引种2—3年便退化失去栽培价值。其主要原因是该种极易感染重型花叶病(X+Y)。此外,一些自国外引入并已确定推广的以及新育成的品种,如“292—20”、“Epoka”、“Capella”、“Star”、“Mira”、“哈交5号”等,均严重感染卷叶病及束顶病,尤其是 Introduction The degradation of potatoes in the southern part of our province is more serious. At present, the “baron” cultivars, which have been cultivated for two to three years since their introduction in the northern part, have lost their cultivation value. The main reason is that the species is extremely susceptible to heavy mosaic disease (X + Y). In addition, some varieties introduced from abroad, such as “292-20”, “Epoka”, “Capella”, “Star”, “Mira” and “Hajiao 5” Infect leaf curl and bunchy top disease, especially