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.

Taper

Terminated

Solanum lycopersicum L. · Tomato

Khareba Volodymyr Vasylovych

2 records

Sunrise F1

Terminated

Solanum lycopersicum L. · Tomato

Hari Besels

1 record

Suenio

Withdrawn

Daucus carota L. · Carrot

Vilmorin SA (FR)

1 record

Sprinter

Active

Anethum graveolens L. · Dill

Tomasz N. Bralewski \Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa w Ożarowie Mazowieckim Spółka z o.o.

1 record

Sprytna

Terminated

Glycine max (L.) Merr. · Soybean

Kobyzieva Liubov Nykyforivna, Riabukha Serhii Stanislavovych, Chernyshenko Pavlo Volodymyrovych, Moshkova Olena Mykolaivna, Matushkin Viktor Oleksiiovych,

2 records

S-PRO-511

Application submitted

Helianthus annuus L. · Sunflower

Tovarystvo z obmezhenoiu vidpovidalnistiu «IEvrosem»

2 records

STYLTO

Application submitted

Daucus carota L. · Carrot

Vilmorin-Mikado

1 record

Snaigiai

Terminated

Lupinus angustifolius L. · Narrow-leaf lupin

Lietuvos agrarinių ir miškų mokslų centro Vokės filialas

1 record

Smaraht

Protection expired

Brassica napus L. · Rapeseed

Sholomkevych Ivanna Myronivna, Abramyk Mykhailo Ivanovych, Sytnik Ihor Danylovych,

2 records

Snihova koroleva

Protection expired

Brassica napus L. · Rapeseed

Sytnik Ihor Danylovych

2 records

Sława z Enkhuizen GOF

Active

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

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

1 record

Skalsa

Terminated

Daucus carota L. · Carrot

Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas

1 record

Semko 18 F1

Terminated

Solanum lycopersicum L. · Tomato

Aleksieiev IUrii Borysovych

2 records

Senator Liuks

Terminated

Brassica napus var. napus · Rapeseed

Oliinyk IEvheniia Ivanivna, Boiko IEvheniia Illivna, Moroz Viktor Mykolaiovych,

1 record

Semko 2005 F1

Terminated

Solanum lycopersicum L. · Tomato

Aleksieiev IUrii Borysovych

2 records

Scarlet red

Application submitted

Solanum lycopersicum L. · Tomato

HM Clause Inc (US)

1 record

Santa Cruz F1

Terminated

Daucus carota L. · Carrot

Robert Maxwell

1 record

Sanraiz F1/Sunrise F1

Terminated

Solanum lycopersicum L. · Tomato

Hari Besels

1 record

Semko 2010 F1

Terminated

Solanum lycopersicum L. · Tomato

Aleksieiev IUrii Borysovych

2 records

Saturno F1

Terminated

Daucus carota L. · Carrot

Robert Prieur

1 record

Rio Grapo

Terminated

Solanum lycopersicum L. · Tomato

Herrit Vlaar, Lipskyi Volodymyr Volodymyrovych,

2 records

Rhonda F1

Active

Beta vulgaris Garden Beet Group · Garden beet

Ger Bimsdeboer

1 record

Riteil

Terminated

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

Naumov Ruslan Olehovych, Krasnok Viacheslav Anatoliiovych,

2 records

Riko

Active

Solanum lycopersicum L. · Tomato

P. de Vries

4 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.