Causal Agents of Hop Dying
DOI:
https://doi.org/10.5073/JfK.2009.10.02Keywords:
Hop, hop dying, Ceratocystis paradoxa, Fusarium oxysporum, Fusarium equiseti, Heterodera humili, ActinomycetesAbstract
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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