Diseases

Alternaria blight

Alternaria

Alternaria blight is a complex of fungal diseases characterized by the appearance of dark spots with concentric zonation on plant organs. The disease leads to tissue necrosis, a reduction in photosynthetic activity, and significant yield losses.

Mentioned in descriptions 2 812 varieties reference book.

Alternaria blight manifests as dark, brown, or black spots that often have a characteristic concentric pattern resembling a target. On leaves, the spots eventually coalesce, causing necrosis, while on stems and fruits, depressed areas form, which, in conditions of high humidity, are accompanied by a velvety olive-colored sporulation coating.

Disease development is most intense at temperatures from +20 to +30°C and high air humidity, including the presence of free moisture. The risk of infection increases significantly with dense planting, mechanical tissue damage, and mineral nutrient deficiencies, as the pathogens often act as a secondary infection attacking weakened plants.

Varietal resistance to Alternaria blight is achieved through a combination of passive barriers, such as tissue structure features, and active responses, such as hypersensitivity, which blocks pathogen development. Resistance evaluation of varieties in breeding is conducted through field trials on natural infestation sites and provocation methods using artificial inoculation, which allows for the differentiation of varieties by the degree of infection.

Sources10

Breakdown by crop

Found in these crops

Tomato 224 Carrot 193 Rapeseed 117 Sunflower 75 Potato 64 Rapeseed 53 White cabbage 25 Mandarin orange 23 Citrus 23 Bell pepper 20 Leek 14 Broccoli 13

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

Napa

Active

Daucus carota L. · Carrot

Bejo Zaden BV (NL)

CZ HR HU LT NL PL +1

9 records

Nevis

Active

Daucus carota L. · Carrot

Bejo Zaden BV (NL)

CZ HR HU NL PL SK

10 records

LG Aviron

Active

Brassica napus var. napus · Rapeseed

Limagrain Europe, F

CZ DE DK FR PL

14 records

Siroco

Active

Daucus carota L. · Carrot

Vilmorin SA (FR)

CZ FR HU PL

11 records

Naval

Active

Daucus carota L. · Carrot

Ger Beemsterboer

HR NL UA

9 records

Elegance

Active

Daucus carota L. · Carrot

NUNHEMS BV, NL

NL PL UA

9 records

Romance

Active

Daucus carota L. · Carrot

Paul Degreef

NL UA

13 records

Queen Anne

Active

Solanum tuberosum L. · Potato

Solana, D

DE UA

14 records

Malou

Active

Solanum tuberosum L. · Potato

Germicopa SAS, FR

FR PT

12 records

Loane

Active

Solanum tuberosum L. · Potato

GERMICOPA SAS

MT PT

11 records

Jerada

Active

Daucus carota L. · Carrot

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL UA

10 records

Berlin

Active

Daucus carota L. · Carrot

Ger Beemsterboer

NL UA

11 records

NK Petrol

Active

Brassica napus var. napus · Rapeseed

SYNGENTA CROP| Syngenta Crop Protection AG

CZ DE HR PL

11 records

PT264

Active

Brassica napus var. napus · Rapeseed

PRUVOT JEAN-CLAUDE

FR HR PL UA

14 records

Umberto KWS

Active

Brassica napus L. · Rapeseed

KWS SAAT SE & CO.KGAA

AT BG HU LT LV RO +1

8 records

Trezzor

Active

Brassica napus var. napus · Rapeseed

Ragt, F

CZ DK FR PL

10 records

Amazzonite

Active

Brassica napus var. napus · Rapeseed

RAGT 2n, FR

CZ DE DK FR UA

12 records

Fontana

Active

Daucus carota L. · Carrot

Bejo Zaden BV, NL-1749 ZH Warmenhuizen

BG HU LT NL PL SI

8 records

SY Marten

Active

Brassica napus var. napus · Rapeseed

Syngenta Crop Protection,CH

CZ PL UA

9 records

Desperado

Active

Brassica napus var. napus · Rapeseed

Dieter Stelling

CZ DK FR PL UA

14 records

Galaxy

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

SVS HOLLAND BV , NL

CZ NL PL SI SK

8 records

Kamaran

Active

Daucus carota L. · Carrot

Bejo Zaden (NL)

CZ HU NL SI SK

8 records

Concurrent

Protection expired

Solanum tuberosum L. · Potato

Kweekbedrijf-Zpc (NL)

BE ES FR IT NL

11 records

Nelson

Active

Brassica napus var. napus · Rapeseed

SYNGENTA SEEDS| Syngenta Seeds GmbH

DE PL SE UA

9 records

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.