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.

Thalessa

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

6 records

Sureton

Active

Allium porrum L. · Leek

NUNHEMS

7 records

Stelvio

Active

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

Syngenta Crop Protection AG

6 records

Strižanka

Active

Capsicum annuum L. · Bell pepper

Institute of vegetable crops(RS)

5 records

Spartak

Active

Solanum lycopersicum L. · Tomato

PRIDNESTROVSKIJ NIISX

3 records

Redstart

Active

Brassica napus var. napus · Rapeseed

New Zealand Institute for Crop and Food Research Ltd

5 records

Rescator

Active

Brassica napus var. napus · Rapeseed

SELGEN A.S

5 records

Radiatus

Active

Allium porrum L. · Leek

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Rapier

Active

Daucus carota L. · Carrot

TAKII EUROPE B V

4 records

Priam

Terminated

Daucus carota L. · Carrot

HM.CLAUSE

3 records

Pallagi 5

Active

Nicotiana tabacum L. · Tobacco

Agtotab, H

4 records

Palanacko cudo

Active

Capsicum annuum L. · Bell pepper

Institute of vegetable crops(RS)

5 records

Norwich

Active

Daucus carota L. · Carrot

BEJO ZADEN

3 records

Mountain Magic

Active

Solanum lycopersicum L. · Tomato

Bejo Zaden B.V.

6 records

Mor

Active

Citrus L. · Citrus

Vardi Aliza

3 records

Milandina

Active

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

Syngenta Crop Protection AG

4 records

Metro

Active

Daucus carota L. · Carrot

Carosem, NL

3 records

Mello Yello

Active

Daucus carota L. · Carrot

BEJO ZADEN B.V.

3 records

Malwira

Active

Brassica rapa L. subsp. campestris (L.) A. R. Clapham · Field mustard

SAATZUCHT HANS LEMBKE

5 records

Leanri

Active

Citrus reticulata Blanco · Mandarin orange

Thomas G. Mc Collum Jack Hearn

4 records

Lanceros

Active

Daucus carota L. · Carrot

Cora Seeds SRL, I

3 records

Laston

Active

Allium porrum L. · Leek

NUNHEMS

11 records

Koloseum

Active

Daucus carota L. · Carrot

SEMO a.s

3 records

Kuroda

Active

Daucus carota L. · Carrot

SEMINIS VEGETABLE SEED IB

3 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

All terms →

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.