Causal Agents of Hop Dying

Authors

  • Wilfried Ahrens Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Christian Berthold Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Günter Böck Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Jessica Droth Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Thomas Fischer Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Jürgen Flessa Fachhochschule Weihenstephan, Abteilung Triesdorf
  • …Christian Freitag Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Hans-Jürgen Gareis Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Helgard I. Nirenberg ehem. Biologische Bundesanstalt für Land- und Forstwirtschaft (BBA), Berlin-Dahlem
  • Georg Otto ehem. BBA, Dresden-Pillnitz
  • Christiane Peetz Fachhochschule Weihenstephan, Abteilung Triesdorf
  • …Andreas Rohn Fachhochschule Weihenstephan, Abteilung Triesdorf
  • Josef Schlang(†) ehem. BBA, Elsdorf/Rheinland
  • Thomas Weidner Fachhochschule Weihenstephan, Abteilung Triesdorf

DOI:

https://doi.org/10.5073/JfK.2009.10.02

Keywords:

Hop, hop dying, Ceratocystis paradoxa, Fusarium oxysporum, Fusarium equiseti, Heterodera humili, Actinomycetes

Abstract

Rotten hop-stocks in the hop growing area of Spalt near Nuremberg were attacked by the vessels-invading fungus Ceratocystis paradoxa. The fungi Fusarium oxysporum and F. equiseti could be isolated from soil of a 100 years old hop garden. By microscopic examination, fungi of the genera Rhizoctonia and Pythium were found, which are known as root rot pathogens. The filamentous roots were severely attacked by hop cyst nematodes (Heterodera humili), and the hairy roots were infested with Actinomycetes, both responsible for the soil exhaustion syndrom.

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Published

2009-10-01

Issue

Vol. 61 No. 10 (2009)

Section

Original Article

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