Abstract
Bacterial ring rot caused by Clavibacter sepedonicus is a zero-tolerance disease in seed potato certification and can cause crop loss and substantial economic damage for affected growers. To address symptom expression and time of expression, 28 cultivars and advanced breeding lines were inoculated with C. sepedonicus and grown in North Dakota and Idaho. Cultivars included russet, chip, and specialty types. Foliar ratings were taken, and first symptoms were observed as early as 91 days after planting in Idaho and 55 days in North Dakota. Symptom characteristics were noted for each cultivar. This information is useful to growers and certification officials. Samples of stems, petioles, stolons, and tubers were also collected at different pre-harvest intervals to determine if C. sepedonicus can be reliably detected in the lab. The ability to detect C. sepedonicus before harvest allows an affected grower to make harvest and management decisions that limit damage caused by bacterial ring rot.
Resumen
La pudrición anular bacteriana (BRR) causada por Clavibacter sepedonicus (Cs) es una enfermedad de cero tolerancia en la certificación de papa-semilla, y puede causar pérdida del cultivo y daño económico substancial a los productores afectados. Para ver la expresión de síntomas y tiempo de expresión, se inocularon 28 variedades y líneas avanzadas de mejoramiento con Cm y se cultivaron en Dakota del Norte y Idaho. Las variedades incluyeron tipos russet, de freído, y de especialidad. Se tomaron lecturas foliares y se observaron los primeros síntomas tan temprano como a los 91 días después de la siembra en Idaho, y 55 días en Dakota del norte. Se notaron las características del síntoma para cada variedad. Esta información es útil para productores y oficiales de certificación. También se colectaron muestras de tallos, pecíolos, estolones y tubérculos, a diferentes intervalos de pre-cosecha, para determinar si Cm puede ser detectada confiablemente. La habilidad para detectar Cm antes de la cosecha le permite a un productor afectado hacer decisiones de cosecha y manejo que limiten el daño causado por BRR.
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Acknowledgements
The authors would like to thank Dr. Rob Davidson and Andrew Houser at Colorado State University for their expertise and for providing Cs inoculum and technical assistance. They also thank Melissa Bertram, Jill Randall, Melinda Lent from University of Idaho, Idaho Falls, Darren Hall from USDA-ARS at Aberdeen, Idaho, Sherry Laug from Idaho Crop Improvement, Idaho Falls, ID, and Dr. Carol Ishimaru from University of Minnesota for providing Cs isolates for inoculum production for the North Dakota trials.
This research was funded by USDA-ARS Federal-State Partnership Potato Program with University of Idaho, North Dakota State University, Idaho Crop Improvement Association and USDA-ARS collaborating.
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Whitworth, J.L., Selstedt, R.A., Westra, A.A.G. et al. Symptom Expression of Mainstream and Specialty Potato Cultivars to Bacterial Ring Rot (Clavibacter sepedonicus) and Evaluation of in-Field Detection. Am. J. Potato Res. 96, 427–444 (2019). https://doi.org/10.1007/s12230-019-09730-x
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DOI: https://doi.org/10.1007/s12230-019-09730-x