许多农户习惯将马铃薯留种，这样做是不科学的。马铃薯是无性繁殖的作物，马铃薯留种，其原种的病毒被一代代保留下来，易引发大面积病毒病，降低产量。特别是马铃薯病毒病高发区，若连年使用自家留下的品种做种，亩产鲜薯不足1000公斤。
马铃薯最多两年应更换一次种薯，最好是每年都换种。选用优质脱毒马铃薯，可比自家薯种产量提高1～2倍，且病害少，质量好。
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