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Diseases

Downy Mildew of Cucumber

Cucumis sativus L.

A fungal disease of cucumber caused by the obligate parasite Pseudoperonospora cubensis. It is characterized by the appearance of angular chlorotic spots on leaves and a distinctive layer of sporulation on the underside of the leaf.

In the reference 394 varieties crop Cucumber, where this is mentioned in the description.

The causative agent of the disease is the oomycete Pseudoperonospora cubensis, which exhibits high variability, leading to the emergence of new aggressive pathotypes and the overcoming of breeding resistance. Symptoms manifest as angular yellowish-green spots on the upper side of the leaf, which eventually turn brown and coalesce. A diagnostic feature under high humidity is the appearance of a grayish-violet or whitish layer of sporulation on the underside of the leaf blade.

In southern regions, the disease can occur in a latent form, manifesting as small chlorotic spots, which complicates visual diagnosis. The consequences of the infection include premature drying and shedding of leaves, deterioration of fruit marketability, and plant death. When cucumber plantings are affected, the fruits lose their taste qualities and characteristic coloration.

For breeding resistant varieties, Dm genetic markers are used, including the specific genes Dm1.1, Dm5.1, Dm5.3 and the non-specific STAYGREEN (CsSGR) gene. The historically significant dm-1 gene has ceased to provide protection due to the evolution of the pathogen. In the international classification of varieties, resistance to the pathogen is labeled with the Pcu code, divided into HR (high) and IR (intermediate) levels.

General information about the subject — on the page Downy mildew.

Sources8

Varieties of Cucumber 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.

Lagos

Active

Cucumis sativus L. · Cucumber

BEJO ZADEN

NL
4 records

Gracius

Active

Cucumis sativus L. · Cucumber

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

NL PL
3 records

Saltan

Active

Cucumis sativus L. · Cucumber

Selekcijos ir sėklininkystės firma ,,Manul"

LT
3 records

Markyza

Active

Cucumis sativus L. · Cucumber

Semo, CZ

CZ
3 records

Reja

Active

Cucumis sativus L. · Cucumber

Instytut Ogrodnictwa - Państwowy Instytut Badawczy \Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa w Ożarowie Mazowieckim Spółka z o.o.

PL UA
6 records

Mozayik

Active

Cucumis sativus L. · Cucumber

Ali Yuksel

UA
4 records

Merlin

Active

Cucumis sativus L. · Cucumber

Majstro Seeds B.V.

NL
3 records

Surazo

Application submitted

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
4 records

Atlas

Terminated

Cucumis sativus L. · Cucumber

Zakład Ogrodniczy Przyborów sp. z o.o. \Instytut Ogrodnictwa - Państwowy Instytut Badawczy

NL PL
3 records

Szeryf

Active

Cucumis sativus L. · Cucumber

Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.

PL
2 records

Ikar

Active

Cucumis sativus L. · Cucumber

PlantiCo Hodowla i Nasiennictwo Ogrodnicze Golebiew sp. z o.o.

PL
3 records

Ines

Active

Cucumis sativus L. · Cucumber

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

PL
2 records

Słowiański

Terminated

Cucumis sativus L. · Cucumber

SPÓJNIA Hodowla i Nasiennictwo Ogrodnicze sp. z o.o.

PL
2 records

Bond

Active

Cucumis sativus L. · Cucumber

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

PL
3 records

Arktika

Active

Cucumis sativus L. · Cucumber

NONGWOO BIO CO.LTD

UA
3 records

Huzar

Terminated

Cucumis sativus L. · Cucumber

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

PL
2 records

Bazyl

Terminated

Cucumis sativus L. · Cucumber

Zakład Ogrodniczy Przyborów sp. z o.o. \Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
2 records

Regal F1

Active

Cucumis sativus L. · Cucumber

Robert Priieur

HR UA
2 records

Tiberias

Active

Cucumis sativus L. · Cucumber

Remzi Dogan, Nunhems B.V.

NL
2 records

Traper

Active

Cucumis sativus L. · Cucumber

Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.

PL
2 records

Vegamoon

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
3 records

Marcel

Active

Cucumis sativus L. · Cucumber

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

PL
2 records

Cyryl

Terminated

Cucumis sativus L. · Cucumber

Zakład Ogrodniczy Przyborów sp. z o.o. \Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
2 records

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