Understanding cultivar decline in sweetpotato for better seed systems interventions

By Kwame Ogero, International Potato Center (CIP) Cultivar decline, a progressive reduction in yields from season to season, is a major challenge to sweetpotato farming. This is largely caused by viruses such as sweet potato feathery mottle virus (SPFMV) and sweet potato chlorotic stunt virus (SPCSV). The two are the most devastating in East Africa []