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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.

PR 44 D 06

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

DK FI FR HR UA
10 records

PT 234

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

DE DK HR UA
13 records

PR 44 W 22

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

DK FR HR UA
9 records

PR 46 W 21

Active

Brassica napus var. napus · Rapeseed

PIONEER SALES| Pioneer Hi-Bred Northern Europe Sales Division GmbH

DE DK HR UA
9 records

PT 271

Active

Brassica napus var. napus · Rapeseed

Pioneer Overseas Corporation US (USA)

DE HR UA
12 records

ARCCIT 1519

Active

Citrus reticulata Blanco · Mandarin orange

George Diederick Janse van Resburg

ES
8 records

Madrigal.

Active

Brassica napus var. napus · Rapeseed

Syngenta Seeds GmbH, DE

CZ FR HR SE
12 records

PT 279 CL

Active

Brassica napus var. napus · Rapeseed

PRUVOT JEAN-CLAUDE

DE HR
11 records

PT 248

Terminated

Brassica napus var. napus · Rapeseed

PIONEER OVERSEAS CORPORATION

DE DK PL UA
8 records

Hysun 33

Active

Helianthus annuus L. · Sunflower

Pacific Seeds Pty Ltd

ES HR IT
9 records

Ruby Valencia

Active

Citrus sinensis (L.) Osbeck · Sweet orange

FREDERIK CAREL VAN WYK

ES
8 records

ARCCIT 1614

Active

Citrus reticulata Blanco · Mandarin orange

George Diederick Janse van Resburg

8 records

ES Neptune

Active

Brassica napus var. napus · Rapeseed

Euralis Semences FR

CZ FR HR
10 records

INV 1310

Active

Brassica napus var. napus · Rapeseed

Dirk Decherf

FR PL UA
8 records

SV 5300 DN

Active

Daucus carota L. · Carrot

Seminis Vegetable Seeds

NL
7 records

Heinz 1301

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

PT UA
4 records

UF 950

Active

Citrus reticulata Blanco · Mandarin orange

Gmitter, JR. Frederick G.

ES
5 records

US Early Pride

Active

Citrus reticulata Blanco · Mandarin orange

THOMAS McCALLUM/JACK HEARN

ES
7 records

SV 7381 DH

Active

Daucus carota L. · Carrot

LAURA MAUPIN

UA
5 records

PAN 7033

Active

Helianthus annuus L. · Sunflower

Pannar (Pty) Ltd

AT
4 records

BE'LLA

Active

Sinapis alba L. · White mustard

KUZNETSOVA GALINA NIKOLAEVNA / POLYaKOVA RAISA SERGEEVNA / LOShKOMOJNIKOV IVAN ANATOL'EVICh / GORLOVA LYuDMILA ANATOL'EVNA / TRUBINA VIKTORIYa SERGEEVNA

RO
5 records

Napoli

Active

Daucus carota L. · Carrot

Bejo Zaden, NL

BG CZ HR HU LT NL +3
17 records

Boléro

Active

Daucus carota L. · Carrot

Vilmorin, F

BG CZ FR HR HU PL +2
20 records

Sagitta

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

CZ IT NL PL UA
27 records

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