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Diseases

Downy Mildew of Hops

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.

Sources8

Varieties of Common hop mentioned in the description

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.

Super Galena

Active

Humulus lupulus L. · Common hop

Roger D Jeske, Joe Brulotte

4 records

Apollo

Active

Humulus lupulus L. · Common hop

Roger D Jeske and Joe Brulotte

4 records

Bravo

Active

Humulus lupulus L. · Common hop

Roger D Jeske, Joe Brulotte

4 records

Hallertauer Taurus

Active

Humulus lupulus L. · Common hop

Franz Gmelch / Herbert Ehrmaier / Dr. Johann Maier in Bayerische Landesanstalt für Bodenkultur und Pflanzenbau,Abschnitt Hopfen

DE HU SI
3 records

Styrian Cardinal

Active

Humulus lupulus L. · Common hop

Slovenian Institute of Hop Research and Brewing

SI
3 records

Styrian Wolf

Active

Humulus lupulus L. · Common hop

Slovenian Institute of Hop Research and Brewing

SI
3 records

Columbus

Active

Humulus lupulus L. · Common hop

Lewis, Gregory K.|Yakima, WA / Zimmermann, Charles E.|Prosser, WA / Hazenberg, Henry|Kennewick, WA (Rule 47)

3 records

Cascade

Active

Humulus lupulus L. · Common hop

Agricultural Research & Extension Center, USA

UA
3 records

First Gold

Active

Humulus lupulus L. · Common hop

Peter Darby

3 records

Pilgrim

Active

Humulus lupulus L. · Common hop

Peter Darby

2 records

31B26

Active

Humulus lupulus L. · Common hop

Slovenian Institute of Hop Research and Brewing

SI
2 records

Hallertauer Magnum

Protection expired

Humulus lupulus L. · Common hop

Franz Gmelch / Herbert Ehrmaier

DE HU
2 records

Admiral

Active

Humulus lupulus L. · Common hop

Peter Darby

3 records

Summit

Active

Humulus lupulus L. · Common hop

Roger D Jeske

2 records

Lemondrop

Active

Humulus lupulus L. · Common hop

Roger D Jeske

2 records

Sultana

Active

Humulus lupulus L. · Common hop

Roger D Jeske

2 records

Boadicea

Active

Humulus lupulus L. · Common hop

Peter Darby

2 records

Triskel

Active

Humulus lupulus L. · Common hop

Wye Hops Ltd.

2 records

Herkules

Active

Humulus lupulus L. · Common hop

Herbert Ehrmaier

2 records

Pilot

Active

Humulus lupulus L. · Common hop

Peter Darby

2 records

Nugget

Active

Humulus lupulus L. · Common hop

Tereschenko Serhii

UA
2 records

Styrian Dragon

Active

Humulus lupulus L. · Common hop

Slovenian Institute of Hop Research and Brewing

SI
2 records