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Diseases

Cucumber leaf spots

Cucumis sativus L.

A group of infectious cucumber diseases including angular leaf spot, corynespora leaf spot, and alternaria leaf spot, which differ in etiology and symptoms. They are characterized by the formation of necrotic spots of various shapes and structures on the leaf blade.

In the reference 244 varieties crop Cucumber, where this is mentioned in the description.

Angular leaf spot is caused by the bacterium Pseudomonas amygdali pv. lachrymans and manifests as vein-delimited spots, which, under high humidity, exude a bacterial ooze that forms a white crust. Genetic resistance to this pathogen is associated with the gBALS4.1 and gBALS6.1 loci, as well as genes involved in salicylic acid metabolism.

Corynespora leaf spot, caused by the fungus Corynespora cassiicola, is characterized by target-like spots with a gray-white center that can coalesce and cause defoliation. Resistance is provided by the cca-3 gene on chromosome 6, which encodes the CC-NB-ARC protein, as well as the Tls5.1 and Tls5.2 QTLs on chromosome 5 and the CsMLO4 protein.

Alternaria leaf spot, caused by fungi of the genus Alternaria, manifests as brown spots with concentric rings and a chlorotic halo. Scab, caused by Cladosporium cucumerinum, primarily affects fruits in the form of water-soaked spots and skin cracking, appearing less frequently on leaves.

General information about the subject — on the page Leaf spot diseases.

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.

Siriana

Active

Cucumis sativus L. · Cucumber

Syngenta Crop Protection AG

NL
4 records

Segura

Active

Cucumis sativus L. · Cucumber

ISI SEMENTI SPA

IT
2 records

Score

Terminated

Cucumis sativus L. · Cucumber

Asgrow Seed Company (US)

FR
2 records

Seculare

Active

Cucumis sativus L. · Cucumber

Nunhems B.V.

NL
4 records

Promotor

Active

Cucumis sativus L. · Cucumber

W. LEGUTKO PRZEDSIEBIORSTWO HODOWLANO NASIENNE SP.Z.O.O

PL
3 records

Oxwell

Terminated

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
2 records

Parys

Active

Cucumis sativus L. · Cucumber

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

PL
5 records

Oktan

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

NL
4 records

Napoleon

Terminated

Cucumis sativus L. · Cucumber

SUNSEEDS

IT
2 records

Mitre

Active

Cucumis sativus L. · Cucumber

SEMILLAS FITO, S.A.

ES
2 records

Mountie

Active

Cucumis sativus L. · Cucumber

Syngenta Crop Protection AG

NL
2 records

Marbon

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
2 records

Makedon

Active

Cucumis sativus L. · Cucumber

Syngenta Seeds B.V.

NL
2 records

Marcel

Active

Cucumis sativus L. · Cucumber

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

PL
2 records

Lafayette

Terminated

Cucumis sativus L. · Cucumber

SUNSEEDS

IT
2 records

Lemosin

Active

Cucumis sativus L. · Cucumber

SEMILLAS FITO, S.A.

ES
2 records

Izal

Active

Cucumis sativus L. · Cucumber

SAKATA VEGETABLES EUROPE SAS

ES
2 records

Ikar

Active

Cucumis sativus L. · Cucumber

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

PL
3 records

Hugon

Active

Cucumis sativus L. · Cucumber

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

PL
2 records

Gynial

Active

Cucumis sativus L. · Cucumber

Vilmorin SA (FR)

FR
2 records

Gwidon

Active

Cucumis sativus L. · Cucumber

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

PL
2 records

Gemini 7

Terminated

Cucumis sativus L. · Cucumber

Pieterpik B.V.

NL
2 records

Gaja

Active

Cucumis sativus L. · Cucumber

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
3 records