为了马铃薯的稳产,使用优良种薯是首要条件。其理由有二,一是因为马铃薯品种不同,收获后大约有50～120天的休眠期,做为种薯必须是经过休眠后仍具有强壮的发芽能力。但是在日本除了北海道以外,由于气候关系不能生产出上述生理状态良好的种薯。二是象病毒病、环腐病之类的病薯,从外观上看无异于健薯,而 In order to stabilize the potato, the use of fine seed is the first condition. There are two reasons for this. First, because of the different varieties of potatoes, there are about 50 to 120 days of post-harvest dormancy. As seed potatoes, they must have strong germination capacity after being dormant. However, in addition to Hokkaido in Japan, it is not possible to produce the above-mentioned seedlings with good physiological state due to the climate change. Second, like the virus disease, such as ring rot disease of the potato, from the appearance is no different from the healthy potato ,.