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本世纪初美国科学家们访问了德国和荷兰后才知道马铃薯种薯的退化是由病毒病引起的,在生长期扩散并由块茎中携带到下一年。当成立的美国马铃薯组织召开了第一次会议后不久,美国的爱达荷州、缅因州、马里兰州、佛蒙特州和威斯康星州以及加拿大的新布伦兹维克省和爱德华岛省首先制定出了马铃薯种薯的鉴定计划。几年内类似的计划在美国的其它州也出现了,加拿大联邦政府还把此计划扩展到全国各省。以品种净化和把病害清除到最低水平为中心的这项马铃薯种薯鉴定引致了马铃薯种薯的改良。
At the beginning of this century, when American scientists visited Germany and the Netherlands, they learned that the degradation of potato seedlings was caused by a viral disease that spread during the growing season and carried from the tubers to the next year. Shortly after the first meeting of the U.S. potato bloc, the United States of Idaho, Maine, Maryland, Vermont and Wisconsin, as well as Canada’s New Bruleewick and Eritrea provinces, first developed Out of potato seed identification program. Similar programs have emerged in other states in the United States in a few years, and the federal government in Canada has extended the program to all provinces in the country. Identification of this potato seed, centered on breed decontamination and disease minimization, led to the improvement of potato seed.