Abstract
The response to potato late blight of 116 potato cultivars and breeding lines was determined in replicated trials conducted between 1980 and 1988. The index of area under the standardized disease progress curve (ASDPC), based on the cultivar Sebago, was used to rank the cultivars and to identify cultivars that had inconsistent disease responses over years. Most of the cultivars were susceptible to late blight; only 10 cultivars out of 66 currently available (including breeding lines) were judged more resistant than Sebago. Nine cultivars were identified as having inconsistent resistance over years. The index ASDPC was less variable than the relative area under the disease progress curve when the yearly disease conditions differed from the normal.
Compendio
En ensayos con repeticiones, conducidos entre 1980 y 1988, se determinó la respuesta de 116 cultivares de papa y líneas de mejoramiento al tizón tardÍo de la papa. El índice de área bajo la curva estandarizada de progreso de la enfermedad (ASDPC), basado en el cultivar Sebago, fue, utilizado para clasificar los cultivares e identificar aquellos que en varios años tuvieron respuestas inconsistentes a la enfermedad. La mayoría de los cultivares fueron susceptibles al tizón tardío y solamente diez de ellos, de un total de 66 disponibles en esa oportunidad (incluyendo lÍneas de mejoramiento), fueron considerados más resistentes que Sebago. Fueron identificados nueve cultivares con resistencia inconsistente en varios años. Cuando las condiciones anuales de la enfermedad fueron diferentes a las normales, el índice ASDPC fue menos variable que el área relativa bajo la curva de progreso de la enfermedad.
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Contribution No. 708.
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(Bud) Platt, H.W., McRae, K.B. Assessment of field responses of potato cultivars and breeder seedlings to potato late blight epidemics. American Potato Journal 67, 427–441 (1990). https://doi.org/10.1007/BF03044511
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DOI: https://doi.org/10.1007/BF03044511