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.

HGI1049

Terminated

Impatiens walleriana Hook. f. · Busy Lizzie

Hem Genetics Research B.V.

1 record

Torus

Terminated

Brassica napus var. napus · Rapeseed

Breus Oksana Serhiivna, Parii IUliia Oleksandrivna, Sydorov Andrii Valeriiovych, Parii IAroslav Fedorovych, Parii Myroslav Fedorovych,

1 record

Syntetik

Application submitted

Brassica napus L. · Rapeseed

Sytnik Ihor Dynylovych

2 records

Solaris OR

Active

Helianthus annuus L. · Sunflower

Miklic Vladimir Jocic Sinisa Dusanic NenadSandra Cvejic Milan Jockovic Zaitsev Oleksii Kovalov Volodymyr

2 records

Shelbi

Application submitted

Brassica napus L. · Rapeseed

Holubiev Kostiantyn Viktorovych, Parii Myrosla Fedorovych,

1 record

Rimi-2/Rimi-2

Active

Helianthus annuus L. · Sunflower

Goran Malidza, Sinisa Jocic, Dragan Skoric,

2 records

Raudis

Terminated

Brassica napus L. · Rapeseed

Kakorin Mykhailo Oleksiiovych, Holubiev Konstiantyn Viktorovych, Parii Myroslav Fedorovych,

2 records

Poliaris

Terminated

Brassica napus L. · Rapeseed

Kakorin Mykhailo Oleksiiovych, Holubiev Kostiantyn Viktorovych, Parii Myroslav Fedorovych,

2 records

Lamber

Application submitted

Brassica napus var. napus · Rapeseed

Kalinichenko Artem Oleksandrovych, Didenko Kostiantyn Oleksandrovych,

2 records

Kan`on

Terminated

Helianthus annuus L. · Sunflower

Dushanich Nened, Shkorych Drahan, Zaitsev Oleksii Borysovych,

2 records

Furios F1

Terminated

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

P.J. Struik

2 records

ES ARKADIIA

Terminated

Helianthus annuus L. · Sunflower

Didier Sauvaire

2 records

Drahan

Terminated

Helianthus annuus L. · Sunflower

Shkorich Dragan, Zaitsev Oleksii Borysovych,

2 records

Canterbury F1

Terminated

Daucus carota L. · Carrot

Ger Bimsdeboer

1 record

Aventador

Application submitted

Brassica napus L. · Rapeseed

Holubiev Kostiantyn Viktorovych, Parii Myroslav Fedorovych,

2 records

Apis

Withdrawn

Helianthus annuus L. · Sunflower

A. Piskov, P. Ivanov, I. Ivanova, P. Petrov, P. Shindrova, M. Hristov, D. Petakov, V. Encheva, L. Nikolova, G. Georgiev

1 record

Patty

Withdrawn

Solanum lycopersicum L. · Tomato

1 record

Calimar

Withdrawn

Brassica napus L. · Rapeseed

1 record

Nerac I

Withdrawn

Daucus carota L. · Carrot

1 record

Lilliput V.F.N. ibrido F 1

Active

Solanum lycopersicum L. · Tomato

1 record

Voiazh F1

Terminated

Solanum lycopersicum L. · Tomato

2 records

Viktoria

Terminated

Daucus carota L. · Carrot

1 record

Viorica

Active

Solanum lycopersicum L. var. lycopersicum · Tomato

1 record

Yurand F1

Application submitted

Solanum lycopersicum L. · Tomato

1 record

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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

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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.