Chard, J., C. 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).