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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

Tomato Early Blight 220 Alternaria Leaf Blight of Carrot 185 Alternaria blight of oilseed rape 108 Potato early blight 86 Alternaria Leaf Spot of Sunflower 61 Alternaria Leaf Spot of Rapeseed 49 Alternaria Brown Spot of Mandarin 22 Alternaria Leaf Spot — White Cabbage 19 Citrus Alternaria Brown Spot 13 Alternaria Leaf Blight of Leek 13 Alternaria Leaf Spot of Broccoli 12 Alternaria Blight of Pepper 11 Tomato Early Blight 9 Alternaria Leaf Spot of White Mustard 7 Alternaria Leaf Blight of Onion 6 Alternaria Leaf Spot — Cauliflower 6 Alternaria Blotch of Apple 6 Tobacco Alternaria Leaf Spot 5 Alternaria blight of Zinnia x marylandica 5 Alternaria Leaf Blight of Melon 4 Alternaria Leaf Spot of Savoy Cabbage 4 Alternaria Leaf Spot — Oilseed Radish 3 Alternaria Leaf Blight of Watermelon 3 Alternaria Leaf Spot — Red Cabbage 3

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.

Celebriti CS

Active

Brassica napus var. napus · Rapeseed

Pierre GARRAUD

UA
4 records

Carvalo

Active

Daucus carota L. · Carrot

Bayer Holland BV, NL

NL
3 records

Candysnax

Active

Daucus carota L. · Carrot

Nunhems B.V.

NL
6 records

Big Beef Plus

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

NL
3 records

Belton

Active

Allium porrum L. · Leek

NAPOLEONSWEG 152

NL
3 records

Blackmillion

Active

Brassica napus var. napus · Rapeseed

RAGT 2n, FR

FR
4 records

Bandolero

Active

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

BEJO ZADEN

NL
4 records

Bavafit

Active

Solanum tuberosum L. · Potato

Bavaria Saat GbR

DE
4 records

Ballad

Active

Brassica napus var. napus · Rapeseed

KWS MOMONT RECHERCHE S.A.R.L

DK
5 records

Bard

Active

Solanum tuberosum L. · Potato

Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy

PL
6 records

Attilio

Active

Daucus carota L. · Carrot

Vilmorin SA (FR)

FR
3 records

Aroma

Active

Solanum lycopersicum L. · Tomato

Yuksel Tohumculuk LTD

UA
6 records

Avatar

Active

Solanum lycopersicum L. · Tomato

MAURIZIO BACCHI

UA
4 records

Avalon

Active

Helianthus annuus L. · Sunflower

PARIJ YaROSLAV FEDOROVICh / PARIJ MIROSLAV FEDOROVICh / ZOLOTAREV KONSTANTIN MITROFANOVICh / YaKOVENKO ANATOLIJ ALEKSANDROVICh

UA
4 records

Aratus

Active

Allium porrum L. · Leek

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
3 records

Alfaro

Active

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

BEJO ZADEN

NL
4 records

Aardvark

Active

Brassica napus var. napus · Rapeseed

Limagrain Europe S.A.S

DE
5 records

YIFAT

Active

Citrus L. · Citrus

THE STATE OF ISRAEL-MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT-AGRICULTURAL RESEARCH ORGANIZATION( ARO)

3 records

SAKZIN017

Active

Zinnia x marylandica D. M. Spooner et al.

Sakata Seed Corporation (SCC)

3 records

SAKZIN022

Active

Zinnia x marylandica D. M. Spooner et al.

SHINJI MINEMURA

3 records

Spitfire

Active

Brassica napus var. napus · Rapeseed

FORAGE INNOVATIONS LTD

4 records

RHM

Active

Citrus L. · Citrus

Royal Honey Pty Ltd ATF Royal Honey IP Trust

4 records

Odem

Active

Citrus reticulata Blanco · Mandarin orange

Nir Carmi^^^Hanna Neuman-Leshem^^^Ahuva Frydman-Shani^^^Pinchas Spiegel-Roy^^^Aliza Vardi^^^Avraham Elhanati^^^Yosef Yaniv^^^Yeoshua Kanonich

9 records

Marbella

Active

Eryngium L. · Sea holly

MOUNTAIN FLOWERS (PVT) LTD

3 records

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