Diseases
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.
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.
Solanum lycopersicum L. · Tomato
Ferry Morse Seed Co.(USA) (US)
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Capsicum annuum L. · Bell pepper
INSTITUTUL DE CERCETARE-DEZVOLTARE PENTRU LEGUMICULTURA SI FLORICULTURA VIDRA
Helianthus annuus L. · Sunflower
EURALIS GENETIQUE
Citrus L. · Citrus
Agricultural Research Council (ARC)
Solanum tuberosum L. · Potato
HZPC Holland B.V.
Brassica oleracea L. (White Cabbage Group) · White cabbage
MARNER GZG| Rijk Zwaan Marne Aktiengesellschaft
Gerbera L. · Gerbera
FLORIST HOLLAND B.V.
Brassica rapa L. subsp. campestris (L.) A. R. Clapham · Field mustard
Germinal Holdings
Citrus L. · Citrus
Pinchas Spiegel-Roy^^^Avraham Elhanati^^^Aliza Vardi
Zinnia x marylandica D. M. Spooner et al.
Sakata Seed Corporation (SCC)
Zinnia x marylandica D. M. Spooner et al.
Sakata Seed Corporation (SCC)
Citrus L. · Citrus
ANGEL TERESA HERMANOS, SA
Malus domestica (Suckow) Borkh. · Apple
YOSHIO YOSHIDA^^^SHICHIRO TSUCHIYA^^^Jun-ichi Soejima
Malus domestica (Suckow) Borkh. · Apple
YOSHIO YOSHIDA^^^SHICHIRO TSUCHIYA^^^Jun-ichi Soejima
Citrus L. · Citrus
VARIOS OBTENTORES
Citrus reticulata Blanco · Mandarin orange
Gmitter, JR. Frederick G.
Helianthus annuus L. · Sunflower
Poljoprivredni Institut Osijek, HR
Brassica napus var. napus · Rapeseed
Breus Oksana Serhiivna, Davydiuk Ihor Mykolaiovych, Koval`chuk Zoreslava Volodymyrivna, Parii IUliia Oleksandrivna, Parii Myroslav Fedorovych, Parii IAroslav Fedorovych, Parii Fedir Mykytovych,
Brassica napus var. napus · Rapeseed
Solomenko Andrii Ivanovych, Breus Oksana Serhiivna, Parii IUliia Oleksandrivna, Koval`chuk Zoreslava Volodymyrivna, Parii Myroslav Fedorovych, Parii IAroslav Fedorovych,
Helianthus annuus L. · Sunflower
Terzic Sreten, Radeka Ilija, Jockovic Milan, Cvejic Sandra, Jocic Sinisa,
Helianthus annuus L. · Sunflower
Dusanic Nenad, Miklic Vladimir, Malidza Goran, Cvejic Sandra, Jocic Sinisa,
Helianthus annuus L. · Sunflower
Miklic Vladimir, Dusanic Nenad, Malidza Goran, Cvejic Sandra, Jocic Sinisa,
Helianthus annuus L. · Sunflower
Miladinovic Dragana, Miklic Vladimir, Dusanic Nenad, Balalic Igor, Cvejic Sandra, Jocic Sinisa,