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.

Phoenix

Active

Daucus carota L. · Carrot

HM Clause, F

4 records

Newcastle

Active

Daucus carota L. · Carrot

BEJO ZADEN

5 records

Monolit

Active

Brassica napus var. napus · Rapeseed

Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR

5 records

Musico

Active

Daucus carota L. · Carrot

Vilmorin SA (FR)

4 records

Morelia

Active

Daucus carota L. · Carrot

Rijk Zwaan Welver, D

4 records

Mariana

Active

Solanum lycopersicum L. · Tomato

WESTERN SEED ESPAÑA, S.A.

5 records

Lisana

Active

Solanum tuberosum L. · Potato

DR. LUDWIG SIMON

9 records

Leonidas

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

Sakata Seed Corporation (SCC)

6 records

Kabala

Active

Capsicum annuum L. · Bell pepper

Syngenta Seeds, NL

4 records

Hobson

Active

Brassica napus L. · Rapeseed

Limagrain UK

5 records

Gold Nijisseiki

Active

Pyrus pyrifolia (Burm. f.) Nakai · Japanese pear

5 records

Fundaxy

Active

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

MONSANTO HOLLAND BV , NL

4 records

Feast

Active

Allium fistulosum L. · Welsh onion

TAKII and CO LTD

4 records

Durance

Active

Daucus carota L. · Carrot

Nunhems, NL

7 records

Deep Purple

Active

Daucus carota L. · Carrot

BEJO ZADEN

5 records

Cordoba

Active

Daucus carota L. · Carrot

BEJO ZADEN B.V, NL

4 records

Dakar

Active

Capsicum annuum L. · Bell pepper

ZERAIM GEDERA

4 records

Cupar

Active

Daucus carota L. · Carrot

BEJO ZADEN B.V, NL

4 records

Columbia

Active

Brassica napus var. napus · Rapeseed

MAS Seeds,FR

6 records

Burney

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

Bejo Zaden, NL

5 records

Abaco

Active

Daucus carota L. · Carrot

SVS HOLLAND BV , NL

4 records

Safor

Active

Citrus L. · Citrus

7 records

Orri

Active

Citrus L. · Citrus

Vardi Aliza

6 records

Matan

Active

Prunus dulcis (Mill.) D. A. Webb · Almond

The State of Israel Ministry of Agriculture & Rural Development Agricultural Research Organization

6 records

1 2 ... 9 10 11 12 13 14 15 ... 41 42 Next

Jump to page 2 6 18 22 24 30 36

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.