American Journal of Potato Research

, Volume 83, Issue 6, pp 447–453 | Cite as

Relationship between silver scurf levels on seed and progeny tubers from successive generations of potato seed

  • B. Geary
  • D. A. Johnson


The level of silver scurf on potato seed tubers on successive generations of potato seed tubers and their progeny tubers was investigated during 3 years in the field. The objective was to determine the importance of seed-borne inoculum on silver scurf development on the subsequent progeny tubers. Silver scurf incidence and severity increased with each generation. Coefficients of determination for disease levels among generations were significant and ranged from 0.89 to 0.97, indicating that seed tuber source accounted for a large proportion of silver scurf on progeny seed tubers. Incidence and severity of silver scurf also increased with decreasing time periods between potato crops in the field. In a field near Paterson, WA, where potatoes had not been previously grown, the severity of silver scurf increased on progeny tubers of cvs Russet Norkotah, Ranger Russet, and Shepody as disease severity increased on seed tubers of successive generations. Disease severity index significantly increased as disease incidence increased. The relationship between the two was best described using a curvilinear regression model.

Additional key words

Helminthosporium solani silver scurf control potato disease 


Durante tres años se investigó en el campo el nivel de costra plateada en tubérculos de semilla de papa, en generaciones sucesivas de tubérculos semilla y de su progenie. El objetivo fue determinar la importancia del inóculo trasmitido por la semilla en el desarrollo de costra plateada sobre los siguientes tubérculos progenie. La incidencia y severidad de la enfermedad aumentó en cada generación. Los coeficientes de determinación para los niveles de enfermedad entre generaciones fueron significativos y alcanzaron de 0.89 a 0.97, lo cual indica que la semilla fue la responsable de una gran proporción de costra plateada sobre la progenie de los tubérculos semilla. La incidencia y severidad de costra plateada también se incrementó con menores períodos de tiempo entre cultivos de papa en el campo. En un campo cerca de Paterson, WA, donde no se había sembrado papa anteriormente, la severidad de costra plateada se incrementó en los tubérculos progenie de Russet Norkotah, Ranger Russet y Shepody a medida que la severidad aumentó sobre los tubérculos semilla de generaciones sucesivas. El índice de severidad de la enfermedad se incrementó significativamente a medida que la incidencia aumentó. La relación entre los dos fue mejor descrita utilizando un modelo de regresión curvilínea.


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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.Department of Plant and Animal SciencesBrigham Young UniversityProvoUSA
  2. 2.Department of Plant PathologyWashington State UniversityPullmanUSA

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