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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.

FREMONT

Active

Hybrids between Citrus reticulata Blanco and Citrus sinensis (L.) Osbeck · Orange

1 record

Eterno

Active

Solanum lycopersicum L. · Tomato

1 record

Amaradia

Terminated

Capsicum annuum L. · Bell pepper

1 record

Braveheart

Active

Solanum lycopersicum L. · Tomato

1 record

Defender

Active

Solanum lycopersicum L. · Tomato

1 record

Charger

Terminated

Solanum lycopersicum L. · Tomato

1 record

MERKUR

Terminated

Brassica napus var. napus · Rapeseed

DK
1 record

Latituda OR

Active

Helianthus annuus L. · Sunflower

UA
2 records

Dragan OR

Active

Helianthus annuus L. · Sunflower

UA
2 records

Antares

Terminated

Brassica napus L. · Rapeseed

IT
1 record

Cardinal

Terminated

Hordeum vulgare L. · Barley

1 record

Patio

Terminated

Solanum lycopersicum L. · Tomato

IT
1 record

MONIKA F1

Terminated

Solanum lycopersicum L. · Tomato

HR
1 record

LINDA F1

Terminated

Solanum lycopersicum L. · Tomato

HR
1 record

BERGEN F1

Terminated

Daucus carota L. · Carrot

HR
1 record

Amsterdammer

Protection expired

Daucus carota L. · Carrot

SI
1 record

Gulliver

Terminated

Solanum lycopersicum L. · Tomato

1 record

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