Current-Season Infection With Ordinary and Recombinant Strains of Potato virus Y Has Detrimental Effects on Chipping Potato Yield and Tuber Quality.

Abstract

Potato virus Y (PVY) is the most economically important virus infecting potatoes worldwide. Current-season spread of PVY occurs when aphids transmit the virus from infected to noninfected plants during the growing season. The impact of current-season PVY infection on yield and quality of chip processing potatoes is not well documented. In a replicated, greenhouse experiment conducted over 2 years, we measured the effect of current-season infection with four PVY strains (PVYO, PVYN-Wi, PVYNTN, and PVYN:O) on chip processing varieties Atlantic, Lamoka, and Snowden. PVY infection decreased yield and tuber specific gravity for some combinations of potato variety and virus strain but did not affect the appearance of chips including the prevalence of stem-end chip defects. This work suggests that current-season infection of chipping potatoes imposes a cost on producers and emphasizes the need for continued investment in seed certification and development of PVY-resistant cultivars.