Sweetpotato virus diseases, probably the most important component of sweetpotato cultivar decline, have only recently begun to receive the research attention they deserve. But researchers working independently sometimes use different names and descriptive terms for what appear to be the same viruses and virus properties, leading to confusion over nomenclature. This booklet is meant to provide guidance in describing the symptoms caused by different viruses. It is a preliminary effort and not intended to illustrate all the symptoms induced by any particular virus.