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American Journal of Potato Research

, Volume 95, Issue 2, pp 191–198 | Cite as

Impact of Seed Cutting and Seed-Borne Inoculum on Daughter Tuber Common Scab and Plant Growth

  • Bryan J. Webster
  • Yu Chen
  • Amanda J. Gevens
Article
  • 138 Downloads

Abstract

Common scab (CS), caused primarily by the filamentous, soilborne bacterium Streptomyces scabies, creates significant challenges in the production of quality potato tubers in global growing regions. Over the past several decades, numerous studies been conducted to improve our understanding of the impact of cultural and pesticide treatments for managing the health of progeny daughter tubers. None of the previous studies, however, have addressed differences between the impacts of CS from whole seed vs. cut seed pieces on resulting disease on daughter tubers. A greenhouse trial was conducted during 2013–2014 to assess the impact of seed type and CS severity on plant health and CS on daughter tubers. Cut and suberized ‘Snowden’ seed pieces (~2 oz.) exhibiting 0, 5, and ≥50% CS severity were sown in 3-gal pots containing a 50:50 mix of sterilized sand and field soil. Whole ‘Snowden’ seed tubers (~2 oz.) with the same three levels of CS severity were sown under the same conditions. At harvest, approximately 20% of daughter tubers from asymptomatic seed pieces (both cut and whole) exhibited symptoms of CS. Disease incidence and severity significantly increased for pieces that had 5 and ≥50% CS across both experiments. Plants grown from whole seed had significantly higher yield, on average, when compared to cut seed. Daughter tubers produced from whole seed resulted in higher CS incidence than those from cut seed in one of our two experimental trials. Our results indicated a clear advantage to plant common scab-free seed potatoes with the aim of producing healthier daughter tubers.

Keywords

Seedborne pathogen Periderm Seed potato Whole seed Cut seed Common scab 

Resumen

La roña común (CS), causada primeramente por la bacteria filamentosa del suelo Streptomyces scabies, crea retos significativos en la producción de tubérculos de papa de calidad en regiones globales del cultivo. En varias décadas pasadas se han conducido numerosos estudios para mejorar nuestro entendimiento del impacto de tratamientos culturales y de plaguicidas para el manejo de la sanidad de tubérculos de progenie. No obstante, ninguno de los estudios previos ha tratado las diferencias entre los impactos de CS de semilla completa vs semilla cortada sobre la enfermedad resultante de tubérculos hijos. Se condujo un ensayo en invernadero durante 2013–2014 para medir el impacto del tipo de semilla y la severidad de CS en la sanidad de la planta y CS en tubérculos hijos. Fragmentos de semilla cortada y suberizada de “Snowden” (~2 oz.) con 0, 5, y ≥ 50% de severidad de CS se plantaron en recipientes de 3 galones con mezcla de 50:50 de arena estéril y suelo de campo. Tubérculos-semilla completos de “Snowden” (~2 oz.) con los mismos tres niveles de severidad se plantaron bajo las mismas condiciones. A la cosecha, aproximadamente el 20% de los tubérculos hijos de las unidades de semilla asintomáticas (tanto fragmentos como completas) exhibieron síntomas de CS. La incidencia y severidad de la enfermedad aumentó significativamente de unidades que tenían 5 y ≥ 50% de CS en ambos experimentos. Las plantas originadas de semilla completa tuvieron significativamente más alto rendimiento, en promedio, cuando se compararon con semilla cortada. Los tubérculos hijos producidos de semilla completa dieron como resultado incidencia más alta de CS que los de semilla cortada en uno de nuestros dos experimentos. Nuestros resultados indicaron una clara ventaja al plantar semilla de papa libre de roña común con el propósito de producir tubérculos hijos más sanos.

Notes

Acknowledgements

I would like to acknowledge funding support through the Wisconsin Department of Agriculture, Trade, and Consumer Protection Specialty Crop Block Grant program and the USDA-Hatch Project of UW-Madison. Thank you to our Langlade County, Wisconsin seed potato grower cooperator for stimulating this research question and providing tubers for this project.

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Copyright information

© The Potato Association of America 2017

Authors and Affiliations

  1. 1.Department of Plant PathologyUniversity of Wisconsin-MadisonMadisonUSA

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