Diseases
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.
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.
Cucumis sativus L. · Cucumber
SPÓJNIA Hodowla i Nasiennictwo Ogrodnicze sp. z o.o.
Cucumis sativus L. · Cucumber
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Cucumis sativus L. · Cucumber
HANNONG SEEDS
Cucumis sativus L. · Cucumber
ShELOBODKIN ALEKSEJ VLADIMIROVICh
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Cucumis sativus L. · Cucumber
Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.
Cucumis sativus L. · Cucumber
Harris Moran Seed Company (USA) (US)
Cucumis sativus L. · Cucumber
ChISTYaKOVA LYuBOV' ALEKSANDROVNA / KLIMENKO NIKOLAJ NIKOLAEVICh / MAKSIMOV SERGEJ VASIL'EVICh
Cucumis sativus L. · Cucumber
SUNSEEDS
Cucumis sativus L. · Cucumber
Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.
Cucumis sativus L. · Cucumber
Seminis Vegetable Seeds
Cucumis sativus L. · Cucumber
Hybrids Ellas Abee
Cucumis sativus L. · Cucumber
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Cucumis sativus L. · Cucumber
W. LEGUTKO PRZEDSIEBIORSTWO HODOWLANO NASIENNE SP.Z.O.O
Cucumis sativus L. · Cucumber
SUNSEEDS
Cucumis sativus L. · Cucumber
PlantiCo Hodowla i Nasiennictwo Ogrodnicze Golebiew sp. z o.o.
Cucumis sativus L. · Cucumber
Syngenta Crop Protection AG
Cucumis sativus L. · Cucumber
Instytut Ogrodnictwa - Państwowy Instytut Badawczy \Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa w Ożarowie Mazowieckim Spółka z o.o.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Cucumis sativus L. · Cucumber
Monsanto Vegetable IP Management B.V.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.