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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 Citrus 23 Mandarin orange 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.

AVASA PRI43

Active

Citrus reticulata Blanco · Mandarin orange

IVIA/AVASA

ES
2 records

AVASA-PRI 49

Active

Citrus reticulata Blanco · Mandarin orange

IVIA

ES
1 record

Bazylevs

Active

Solanum lycopersicum L. · Tomato

Shkl`oda Natalia Stepanivna, Diachenko Liudmyla Ivanivna, Tolinova Tetiana Oleksiivna, Lysak Nataliia Serhiivna, Pylypenko Liubov Vasylivna, Krutko Roman Vasylovych,

UA
2 records

AUTUMN BEIT ALPHA

Terminated

Allium cepa L. var. cepa · Onion

Kibbutz Beit Alpha

ES
1 record

Arkona

Active

Helianthus annuus L. · Sunflower

Kopylov Serhii Ihorovych

UA
2 records

Aniuta F1

Application submitted

Solanum lycopersicum L. · Tomato

Paramonova Tetiana Vladyslavivna, Orlova Anna Ihorivna, Chernenko Kateryna Mykhailivna, Miroshnichenko Tetiana Mykolaivna, Udovichenko Svitlana Mykolaivna, Krutko Roman Vasylovych,

UA
3 records

Armada KL

Terminated

Helianthus annuus L. · Sunflower

David Mogford

UA
2 records

ALBOREA

Active

Citrus reticulata Blanco · Mandarin orange

VARIOS OBTENTORES

ES
2 records

ALKA

Withdrawn

Solanum tuberosum L. · Potato

IRPT.ZAMARTE

ES
1 record

Aivenho

Terminated

Capsicum annuum L. · Bell pepper

Timin Olei IUriiovych, Muzhylko Viktor Valentynovych,

UA
1 record

909GD08/77

Active

Triticum durum Desf. · Durum wheat

S.I.S. SOCIETA' ITALIANA SEMENTI

IT
1 record

Abaco F1

Active

Daucus carota L. · Carrot

Hari Besels

UA
1 record

Alexsia F1

Terminated

Solanum lycopersicum L. · Tomato

J. Hoogstarten

UA
2 records

Akvilon F1

Protection expired

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

Monakhos Hryhorii Fedorovych

UA
2 records

807A

Withdrawn

Helianthus annuus L. · Sunflower

Dobroudja Agricultural Institute - General Toshevo (BG)

BG
1 record

VERA

Active

Citrus L. · Citrus

IVIA-LNL-PAG-JCI-JJR-JPL-COC-ANL

1 record

508GD05/101

Active

Triticum durum Desf. · Durum wheat

S.I.S. SOCIETA' ITALIANA SEMENTI

IT
1 record

Sugar Lia

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Walther Faedi^^^Gianluca Baruzzi^^^Pierluigi Lucchi

2 records

Red Delight

Active

Allium cepa L. var. cepa · Onion

The Sweet Onion company Ltd.

1 record

SAKZIN020

Active

Zinnia x marylandica D. M. Spooner et al.

Sakata Seed Corporation (SCC)

1 record

OMET

Active

Citrus L. · Citrus

IVIA

1 record

Murina

Active

Citrus L. · Citrus

Salvador Zaragoza Adriaensens^^^José Luis Pardo Pascual

5 records

MONCALINA

Active

Citrus L. · Citrus

VARIOS OBTENTORES

2 records

HGI1068

Terminated

Impatiens walleriana Hook. f. · Busy Lizzie

Hem Genetics Research B.V.

1 record

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