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.

VT60788

Terminated

Solanum lycopersicum L. · Tomato

2 records

Bukoz

Active

Linum usitatissimum L. · Common flax

2 records

Gwen

Active

Solanum tuberosum L. · Potato

Germicopa SAS, FR

1 record

Armada

Active

Helianthus annuus L. · Sunflower

Tovarystvo z obmezhenoiu vidpovidalnistiu "Ahronasinniaprom"

2 records

Zlahoda

Active

Solanum tuberosum L. · Potato

Bondarchuk Anatolii Andriiovych, Osypchuk Andrii Antonovych, Taktaiev Borys Anatoliiovych, Nazar Stefaniia Hryhorivna, Sidakova Oksana Vladyslavivna, Kupriianova Tetiana Mykolaivna, Cherednychenko Liubov Mykolaivna, Zakharchuk Nataliia Anatoliivna, Borivs

2 records

Zolota osin`

Active

Solanum lycopersicum L. · Tomato

Rudas Liudmyla Andriivna

2 records

YeS Avalon

Active

Helianthus annuus L. · Sunflower

Posunko Anton Olehovych, Shatsman Dmytro Oleksandrovych,

2 records

Yaqui F1

Active

Solanum lycopersicum L. · Tomato

Hari Besels

1 record

YeS Bravus

Active

Helianthus annuus L. · Sunflower

Posunko Anton Olehovych, Bushulian Oleh Volodymyrovych, Shatsman Dmytro Oleksandrovych,

2 records

Vytėnų Nanto

Terminated

Daucus carota L. · Carrot

Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas

1 record

Volcano F1

Application submitted

Daucus carota L. · Carrot

Daniel Gabillard

2 records

Veloz F1

Active

Solanum lycopersicum L. · Tomato

Doug Heath

1 record

VERA

Active

Citrus reticulata Blanco · Mandarin orange

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

1 record

Uno Rosso F1

Active

Solanum lycopersicum L. · Tomato

Dr. Mario Martinelli

2 records

Victory F1

Terminated

Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage

Hari Besels

1 record

Vaiguva

Terminated

Daucus carota L. · Carrot

Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas

1 record

Tommy Toe

Terminated

Solanum lycopersicum L. · Tomato

Domaine Public (FR)

1 record

Tiramisu

Terminated

Gerbera jamesonii Bolus ex Hook. f. · Barberton daisy

Florist De Kwakel B.V. Gerbera Kulturen

1 record

Trafford F1

Application submitted

Daucus carota L. · Carrot

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

2 records

Toskama

Terminated

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

MARNER GZG| Rijk Zwaan Marne Aktiengesellschaft

1 record

Torch F1

Terminated

Solanum lycopersicum L. · Tomato

Her Bimsdeboer

1 record

TORCH

Terminated

Brassica napus var. napus · Rapeseed

Ministry of Agriculture

1 record

Trophy ZIF

Active

Daucus carota L. · Carrot

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

1 record

Tanya F1

Active

Solanum lycopersicum L. · Tomato

Teresa Beck Bunn

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.