Diseases
Humulus lupulus L.
A dangerous hop disease caused by the oomycete Pseudoperonospora humuli, characterized by systemic infection resulting in stunted shoots ("spikes") and necrosis of leaves and cones.
In the reference 60 varieties crop Common hop, where this is mentioned in the description.
The causative agent of the disease is the obligate biotrophic oomycete Pseudoperonospora humuli. The most characteristic sign of systemic infection, where the pathogen mycelium overwinters in buds and rhizomes, is the appearance of "spikes" — stunted shoots with shortened internodes and curled leaves.
On leaves, the infection manifests as angular chlorotic spots bounded by veins, with a gray or violet-black fungal growth forming on the underside under high humidity. Hop cones are also affected, leading to the formation of necrotic spots and a reduction in crop quality.
In hop breeding for resistance to this pathogen, standardized resistance genes are not used, and the trait of resistance itself is considered a complex indicator. The existence of clearly differentiated intraspecific races of Pseudoperonospora humuli is poorly supported in scientific practice.
General information about the subject — on the page Downy mildew.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Humulus lupulus L. · Common hop
Slovenian Institute of Hop Research and Brewing
Humulus lupulus L. · Common hop
Peter Darby
Humulus lupulus L. · Common hop
Peter Darby
Humulus lupulus L. · Common hop
Peter Darby
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
Humulus lupulus L. · Common hop
MUNTEAN LEON SORINCERNEA SOLOVASTRUSALONTAI ALEXANDRUMORAR GAVRILAVARBAN DANMUNTEAN LEONDUDA MARCELMUNTEAN SORINVARBAN RODICATOFANA MARIA
Humulus lupulus L. · Common hop
Alexander Feiner
Humulus lupulus L. · Common hop
Tereschenko Serhii
Humulus lupulus L. · Common hop
Herbert Ehrmaier
Humulus lupulus L. · Common hop
GMELCH| Franz Gmelch / EHRMAIER| Herbert Ehrmaier
Humulus lupulus L. · Common hop
Liashenko Mykola Ivanovych, Zahrafova Maiia Iosypivna,
Humulus lupulus L. · Common hop
Bayerische Landesanstalt (DE)
Humulus lupulus L. · Common hop
Roger D Jeske
Humulus lupulus L. · Common hop
Roger D Jeske