Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: 8/8/2004
Publication Date: 1/1/2005
Citation: Whitworth, J. L., Nolte, P., McIntosh, C. S, and Davidson, R. D. 2005. Effect of Potato Virus Y on yield of potato grown under different nitrogen levels (abs). American Journal of Potato Research 82:(1)96
Technical Abstract: Potato Virus Y (PVY) is a yield limiting factor in potato production. Typical foliar symptoms can include veinal necrosis, leaf drop, and a mosaic pattern sometimes accompanied by leaf roughness. Some varieties such as Russet Burbank produce “typical” symptoms in response to PVY, while others such as Russet Norkotah express very mild symptoms, which border on latency. PVY has been shown to reduce yield in varieties with latent and typical symptom expression. Amount of nitrogen applied also influences a plant’s yield response. This study was done to determine if extra nitrogen can mitigate the yield reduction caused by PVY. PVY and healthy seed of Russet Norkotah, Crestone Russet, and Russet Burbank was prepared by growing increase blocks. Tubers from PVY infected and healthy plants were used the following year to plant plots that consisted of 7 healthy and 7 PVY infected plants, planted at three different nitrogen levels. Each PVY designated plant was tested early and late in the growing season to confirm its virus status. Plants from healthy seed were serologically tested just before vine kill and any PVY positive plants were not harvested. Yield results from the plots showed no difference between nitrogen levels for either healthy or PVY infected plots. Significant differences did exist between healthy and PVY plots at different nitrogen levels but not in all varieties. PVY also appeared to influence tuber number at different nitrogen levels. Increased nitrogen did not make up for the PVY-yield reduction evident in some varieties.