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This study documented the presence of PVYo, PVYNTN, and PVYN-Wi strains in western Washington in 2012 and 2013, representing the first detections of PVYNTN and PVYN-Wi in this potato growing region. Chieftain and Yukon Gold plantings showed an unexplained shift to a higher proportion of PVYN-Wi in 2013 compared to 2012. In 2012, 56.4 % of positive plants pooled across cultivars were affected by PVY...