建立健全良种繁育体系,是推广应用脱毒薯的必要条件。3年来,本溪所已完成高山地区3级繁育体系的研究;大连所建立了春繁夏播2年4级的繁育体系;蚕业所建立了冷藏夏播3级繁育体系;建平示范场建立了高海拔3级繁育体系。以上4种体系各具特色,为推广脱毒薯提供了可行的模式。 Establishing and perfecting seed breeding system is a necessary condition to promote the application of virus-free potato. In the past three years, Benxi has completed the research on the third-level breeding system in the mountainous areas; Dalian has established a breeding system with two years and four-year spring and summer seeding; the sericulture has established a third-level breeding system for chilled summer sowing; High-altitude breeding system. These four systems have their own characteristics, to promote the drug-free potato provides a viable model.