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.
Helianthus annuus L. · Sunflower
Pankovic Dejana, Gvozdenovic Sandra, Jocsc Sinisa,
Brassica napus var. napus · Rapeseed
Breus Oksana Serhiivna, Davydiuk Ihor Mykolaiovych, Parii IUliia Oleksandrivna, Koval`chuk Zoreslava Volodymyrivna, Parii Myroslav Fedorovych, Parii IAroslav Fedorovych, Parii Fedir Mykytovych,
Solanum tuberosum L. · Potato
Zelia Aureliia Heorhiivna, Halahan Tetiana Oleksandrivna, Kozun` Ihor Ivanovych, Tymko Liudmyla Volodymyrivna, Pysarenko Nataliia Vasylivna, Lysak Olena Andriivna, Andriienko Tetiana Mykhailivna, Tymko Mykola Hryhorovych, Sydorchuk Vasyl Ivanovych,
Solanum lycopersicum L. · Tomato
Brassica napus var. napus · Rapeseed
Solanum tuberosum L. · Potato
Brassica napus var. napus · Rapeseed
Solanum lycopersicum L. · Tomato
Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon
Brassica oleracea L. (Broccoli Group) · Broccoli
Solanum lycopersicum L. · Tomato
Solanum lycopersicum L. · Tomato
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Brassica napus var. napus · Rapeseed
Daucus carota L. · Carrot
Daucus carota L. · Carrot
Solanum lycopersicum L. · Tomato
Solanum lycopersicum L. · Tomato
Brassica napus var. napus · Rapeseed
Helianthus annuus L. · Sunflower
Daucus carota L. · Carrot
Brassica napus var. napus · Rapeseed
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Brassica napus var. napus · Rapeseed