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.

Debut F1

Active

Solanum lycopersicum L. · Tomato

Hari Besels

1 record

Cortes

Protection expired

Brassica oleracea L. convar. botrytis (L.) Alef. · Cauliflower

Syngenta Seeds B. V.

1 record

Count

Terminated

Solanum lycopersicum L. · Tomato

Petoseed Co INC (US)

1 record

Compagnon

Terminated

Solanum tuberosum L. · Potato

Veenkoloniale Boeren Bond (NL)

2 records

Cordoba F1

Active

Daucus carota L. · Carrot

Ger Bimsdeboer

1 record

Carine

Protection expired

Sinapis alba L. · White mustard

Ringot (FR)

1 record

Caline

Terminated

Solanum lycopersicum L. · Tomato

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Chicago F1

Terminated

Solanum lycopersicum L. · Tomato

Sylvain Bontems

1 record

CHARGER (W-425)

Terminated

Solanum lycopersicum L. · Tomato

WESTERN SEED ESPAÑA, S.A.

1 record

Buena vista

Active

Solanum lycopersicum L. · Tomato

SAKATA SEED AMERICA INC US

1 record

Canada F1

Active

Daucus carota L. · Carrot

Her Bimsdeboer

1 record

Cherry Blossom

Application submitted

Solanum lycopersicum L. · Tomato

Frank Tardieu

2 records

CARINA

Withdrawn

Daucus carota L. · Carrot

Seminis Vegetable Seeds

1 record

Borivs`kyi

Active

Solanum lycopersicum L. · Tomato

Kovbasenko Raisa Vasylivna, Kovbasenko Kateryna Opanasivna, Kovbasenko Vasyl` Mykhailovych, Hubar Mykola Ivanovych, Horkutsenko Oleksandr Vasyl`ovych,

2 records

Bradley

Terminated

Solanum lycopersicum L. · Tomato

Domaine Public (FR)

1 record

Cami

Active

Citrus reticulata Blanco · Mandarin orange

STARRANTINO ANGELO

1 record

BNJ2107

Withdrawn

Brassica napus L. · Rapeseed

RAGT 2N S.A.S

1 record

BLANKO

Protection expired

Anethum graveolens L. · Dill

A.HANSEN'S AMAGERFRØ A/S

1 record

Boro F1

Active

Beta vulgaris Garden Beet Group · Garden beet

Her Bemsdeburh

2 records

Bronowicka Ostra

Terminated

Capsicum annuum L. · Bell pepper

PlantiCo Hodowla i Nasiennictwo Ogrodnicze Swietoslaw sp. z o.o.

1 record

Bobryts`kyi

Active

Solanum lycopersicum L. · Tomato

Korets`ka Olena Oleksandrivna, Kovbasenko Raisa Vasylivna, Kovbasenko Kateryna Opanasivna, Kovbasenko Vasyl` Mykhailovych, Hubar Mykola Ivanovych, Horkutsenko Oleksandr Vasyl`ovych,

2 records

Belenzian Italia

Withdrawn

Crambe hispanica L. subsp. abyssinica (Hochst. ex R. E. Fr.) Prina · Abyssinian mustard

CREA- CENTRO DI RICERCA PER LE COLTURE INDUSTRIALI (CREA-CI-BO)

1 record

Belgrado F1

Active

Daucus carota L. · Carrot

Ger Bimsdeboer

1 record

Avrora F1

Terminated

Solanum lycopersicum L. · Tomato

Panchev IUrii Ivanovych

2 records

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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.