American Potato Journal

, Volume 61, Issue 10, pp 599–609 | Cite as

Assessment and analyses for the interpretation of potato late blight response in field studies

  • H. W. Platt
  • G. C. C. Tai


Potato seedlings and cultivars were successfully subjected to moderate to heavy late blight pressure in field plots to which a race complex of the pathogen was applied. Multiple assessments through the course of the epidemics revealed differences in overall disease susceptibility or resistance. Differences were also demonstrated in disease response patterns among potato lines with similar overall disease ratings. Use of principal component and cluster analyses established discrete groupings of potato lines. This provides a basis for a more objective interpretation of the results in identifying both overall disease response and pattern (slow or fast) of response of potato cultivars and breeding lines.

Key Words

Solanum tuberosum potato Phytophthora infestans late blight resistance principal component analysis cluster analysis 


Plántulas y cultivares de papa fueron satisfactoriamente sometidas a una moderada y fuerte presión de tizón tardío en parcelas de campo a las cuales se les aplicó una mezcla de razas. Determinaciones múltiples a través del curso de la epidemia reveló diferencias en cuanto a la resistencia o susceptibilidad total. Diferencias fueron también demostradas en patrones de respuesta a la enfermedad entre líneas de papa con similares grados de infección. El uso de análisis de componentes principales y análisis multivarial (clustar) estableció grupos de líneas de papa. Esto prové una base para una interpretación mas objetiva de los resultados en identificar patrones y respuesta a la enfermedad (lenta o rápida) en la evaluación de cultivares y lineas de mejoramiento de papa.


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Copyright information

© Springer 1984

Authors and Affiliations

  • H. W. Platt
    • 1
  • G. C. C. Tai
    • 1
  1. 1.Agriculture Canada, Research StationFrederictonCanada

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