Potato Research

, Volume 32, Issue 3, pp 353–357 | Cite as

A rapid scoring technique for potato tuber disease assessment

  • Helen E. Stewart
  • R. L. Wastie
Short Communication


Three methods of scoring disease severity were compared on potato tubers infected with either common scab, gangrene or dry rot. For each disease, replicated samples of infected tubers were taken of 12–14 cultivars representing a range of reaction from resistant to susceptible, and disease severity assessed by 1) estimating the proportion of the surface area affected by the disease, 2) calculating the percentage of tubers infected to a pre-determined amount, 3) an overall ‘glance score’ on a 1–9 scale of decreasing infection. The third method gave scores which correlated closely with the others, and since it is direct and simple to use, it has become the preferred method in disease screening tests at the Scottish Crop Research Institute.

Additional key words

dry rot gangrene common scab disease screening 


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  1. Anonymous, 1987a. Classified list of potato varieties England and Wales 1988. Cambridge: National Institute of Agricultural Botany, 16 pp.Google Scholar
  2. Anonymous, 1987b. Beschrijvende Rassenlijst voor Landbouwgewassen 1987. Bennekom: Rijksinstituut voor het Rassenonderzoek van Cultuurgewassen. 336 pp.Google Scholar
  3. Bjor, T. & L. Roer, 1980. Testing the resistance of potato varieties to common scab.Potato Research 23: 33–47.Google Scholar
  4. Cruickshank, G., H. E. Stewart & R. L. Wastie, 1982. An illustrated assessment key for foliage blight in potatoes.Potato Research 25: 213–214.CrossRefGoogle Scholar
  5. Førsund, E., 1987. Keys applicable for qualitative characters in potato research. In: E. Førsund (Ed.), Potato disease assessment keys, p. 6–18. As, Norway: European Association for Potato Research, Section for Pathology, Committee for Disease Assessment.Google Scholar
  6. Gans, P. T. & P. Wooster, 1987. Methods for calculating 1–9 values to express the resistance of potato varieties to disease. In: G. J. Jellis & D. E. Richardson (Eds), The production of new potato varieties: technological advances, p. 153–156. Cambridge University Press.Google Scholar
  7. Malcolmson, J. F., 1976. Assessment of field resistance to blight (Phytophthora infestants) in potatoes.Transactions of the British Mycological Society 67: 321–325.Google Scholar
  8. Porteous, R. L. & A. Y. Muir, 1987. Some measurements of the performance of an experimental quality grading machine for potatoes.Potato Research 30: 23–24.CrossRefGoogle Scholar
  9. Stegemann, H. & D. Schnick, 1985. Index 1985 of European potato varieties. Berlin: Biologischen Bundesanstallt für Land-und Fortwirtschaft, 219 pp.Google Scholar
  10. Wastie, R. L., P. D. S. Caligari, Helen E. Stewart & G. R. Mackay, 1988. Assessing the resistance to gangrene of progenies of potato (Solanum tuberosum L.) from parents differing in susceptibility.Potato Research 31: 355–365.Google Scholar
  11. Wastie, R. L., Helen E. Stewart & J. Brown, 1989. Comparative susceptibility of some potato cultivars to dry rot caused byFusarium sulphureum andF. solani var.coeruleum.Potato Research 32: 49–55.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Helen E. Stewart
    • 1
  • R. L. Wastie
    • 1
  1. 1.Scottish Crop Research InstituteDundeeUK

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