Chard, J., Carolyn Nisbet, K. Fraser, S. Goodfellow, C. James, W. Monger, A. Schlenzig, J. Pickup, and C. J. Jeffries. "Safeguarding the health of potatoes in Scotland." In Proceedings Crop Protection in Northern Britain 2012, 207-214. Dundee, 2012.
Variety has a very important effect on the incidence of virus symptoms observed at classification inspections. The term ‘varietal propensity’ has been adopted to describe whether symptoms observed within a variety are above or below the average across the whole Scottish seed crop (i.e. Propensity = % of diseased crops of variety /% of diseased crops of all varieties).
Potato-infecting viruses cause significant damage worldwide and represent a significant threat to seed potato industries. The incidence of virus in seed potatoes can have a significant impact on crop quality (both seed and ware).