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Diseases

Downy mildew — Onion

Allium cepa L. var. cepa

A dangerous onion disease caused by the oomycete Peronospora destructor, manifesting in diffuse and local forms with the formation of a grayish-violet coating on the leaves.

In the reference 59 varieties crop Onion, where this is mentioned in the description.

The causative agent of the disease is the obligate pseudofungus Peronospora destructor. The disease affects all parts of the plant and proceeds in two stages: systemic diffuse, in which plants turn yellow and deform, and local, characterized by the appearance of chlorotic spots. Under conditions of high humidity and moderate temperatures, a grayish-violet sporulation coating develops on the affected areas, leading to necrosis and tissue death.

In breeding for resistance to the pathogen, the dominant gene Pd1 is identified, which is detected in genotypes using the molecular marker DMR1. Work on developing resistant forms is often based on interspecific hybridization, for example with Allium roylei; however, in widespread production, field resistance or tolerance of varieties is more common than absolute immunity.

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

Sources8

Varieties of Onion 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.

Daytona

Active

Allium cepa L. var. cepa · Onion

Bejo Zaden BV (NL)

BG CZ HR NL PL

7 records

Centurion

Active

Allium cepa L. var. cepa · Onion

Bejo Zaden BV (NL)

CZ HR NL PL

6 records

Hyfield

Protection expired

Allium cepa L. var. cepa · Onion

Bejo Zaden B.V.

CZ NL PL

5 records

Carlos

Active

Allium cepa L. var. cepa · Onion

Vilmorin SA (FR)

FR HR PL

5 records

Sterling

Active

Allium cepa L. var. cepa · Onion

Seminis Vegetable Seeds

ES NL PL

4 records

Ibis

Active

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

CZ NL

4 records

Thunderstone

Active

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

NL

4 records

Drago

Terminated

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

NL PL

3 records

Agra

Active

Allium cepa L. var. cepa · Onion

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

ES PL

4 records

Safrane

Active

Allium cepa L. var. cepa · Onion

Bejo Zaden BV (NL)

HR NL

3 records

Manuella

Active

Allium cepa L. var. cepa · Onion

Enza Zaden Beheer B.V.

NL

2 records

Prospero

Application submitted

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

NL

3 records

Red Arrow

Active

Allium cepa L. var. cepa · Onion

ALLIUM SEEDS UK LTD

NL

3 records

Ławica

Active

Allium cepa L. var. cepa · Onion

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

PL

3 records

Redlander

Active

Allium cepa L. var. cepa · Onion

Bejo Zaden B.V., De Groot en Slot B.V.

NL

4 records

Red Carpet

Active

Allium cepa L. var. cepa · Onion

Bejo Zaden B.V., De Groot en Slot B.V.

NL

3 records

Santero

Active

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

NL

3 records

Grabowska

Active

Allium cepa L. var. cepa · Onion

Gospodarstwo Nasiennictwa i Hodowli Roślin Eugeniusz Bogdan Żurański \Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL

3 records

Gamay

Active

Allium cepa L. var. cepa · Onion

Enza Zaden Beheer B.V.

NL

3 records

Redshine

Active

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

NL

3 records

Boga

Active

Allium cepa L. var. cepa · Onion

Bejo Zaden B.V., De Groot en Slot B.V.

NL

4 records

Haeckero

Active

Allium cepa L. var. cepa · Onion

Hazera Seeds B.V.

NL

4 records

Vulcan200

Active

Allium cepa L. var. cepa · Onion

ALLIUM SEEDS UK LTD

NL

2 records

Golazo

Active

Allium cepa L. var. cepa · Onion

HAZERA SEEDS BV

ES

3 records