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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.

Helios

Active

Humulus lupulus L. · Common hop

S.S. Steiner Inc.

1 record

Harmonie

Active

Humulus lupulus L. · Common hop

Chmelařský institut s.r.o. (CZ)

CZ
2 records

Smaragd

Active

Humulus lupulus L. · Common hop

Herbert Ehrmaier

DE
1 record

Spalter Select

Terminated

Humulus lupulus L. · Common hop

GMELCH| Franz Gmelch / EHRMAIER| Herbert Ehrmaier

DE
1 record

Nobella

Application submitted

Humulus lupulus L. · Common hop

Simon H. Steiner Hopfen GmbH

1 record

Hersbrucker Pure

Terminated

Humulus lupulus L. · Common hop

GMELCH| Franz Gmelch / EHRMAIER| Herbert Ehrmaier

DE
1 record

Saphir

Active

Humulus lupulus L. · Common hop

Herbert Ehrmaier

DE
1 record

90A263

Active

Humulus lupulus L. · Common hop

IHP Slovenije (SI)

SI
1 record

Opal

Active

Humulus lupulus L. · Common hop

Herbert Ehrmaier

DE
1 record

Lubelski

Terminated

Humulus lupulus L. · Common hop

Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy

PL
1 record

Magnat

Active

Humulus lupulus L. · Common hop

Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy

PL
1 record

Juno

Active

Humulus lupulus L. · Common hop

CZ
2 records

Vuch 70, Bor

Terminated

Humulus lupulus L. · Common hop

SK
1 record

Lucan

Active

Humulus lupulus L. · Common hop

SK
1 record

Bohemie

Active

Humulus lupulus L. · Common hop

CZ
2 records

Blšanka

Active

Humulus lupulus L. · Common hop

SK
1 record

Sirem

Active

Humulus lupulus L. · Common hop

SK
1 record

Jupiter

Active

Humulus lupulus L. · Common hop

CZ
2 records

Brewers Gold

Protection expired

Humulus lupulus L. · Common hop

RO
1 record

Aurea

Active

Humulus lupulus L. · Common hop

SK
1 record

Blato

Active

Humulus lupulus L. · Common hop

SK
1 record