American Potato Journal

, Volume 56, Issue 1, pp 35–41 | Cite as

The effect of harvest date and tuber-borne sclerotia on the severity ofRhizoctonia disease of potato

  • Neil C. Gudmestad
  • Richard T. Zink
  • J. E. Huguelet


Experiments performed in 1976 and 1977 examined the effect of harvest date on the development of tuber-borne sclerotia and the effect of these sclerotia onRhizoctonia disease severity of potato. Results from tubers harvested at seven weekly intervals in 1975 indicate maximum sclerotial development occurred 3–4 weeks after vine killing. When these tubers were planted the following year, few differences occurred in disease severity of stems and stolons with respect to prior harvest date. However, the tubers which had remained in the ground 4–7 weeks after vine killing in 1975 produced the largest and greatest number of sclerotia on progeny tubers harvested in 1976. Experiments in 1976 and 1977 demonstrated that tubers with approximately 20% sclerotial coverage produced stems and stolons with significantly more severeRhizoctonia disease compared to tubers with no visible sclerotia. Sclerotial coverage on tubers of less than 20% did not significantly increase disease severity.

Key words

Rhizoctonia disease black scurf tuber-borne sclerotia harvest date disease severity cultural control 


Experimentos realizados en 1976 y 1977 analizaron los efectos de fecha de cosecha en el desarrollo de esclerotes en los tubérculos y el efecto de estos esclerotes en la severidad del ataquede Rhizoctonia en papas. Resultados de tubérculos cosechados semanalmente por siete semanas en 1975 indican que el máximo desarrollo de esclerotes ocurrió 3–4 semanas luego que el follaje fue muerto. Cuando estos tubérculos fueron plantados al año siguiente pocas diferencias ocurrieron en severidad de la en fermedad en tallos y estolones con respecto a tubérculos cosechados en fechas anteriores. Sin embargo, los tubérculos que permanecieron en el campo 4–7 semanas luego que el follaje fue muerto, en 1975, produjeron más número y esclerotes más grandes en los tubérculos progenies cosechados en 1976. Experimentos en 1976 y 19877 demostraron que tubérculos con aproximadamente 20% de esclerotes cubriendo la superficie produjeron tallos y estolones significativamente más afectados porRhizoctonia comparado con tubérculos sin esclerotes visibles. Esclerotes en cantidad menor de 20% cubriendo la superficie de los tubérculos no aumentaron significativamente la severidad de la enfermedad.


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Copyright information

© Springer 1979

Authors and Affiliations

  • Neil C. Gudmestad
    • 1
  • Richard T. Zink
    • 1
  • J. E. Huguelet
    • 1
  1. 1.Department of Plant PathologyNorth Dakota State UniversityFargo

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