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.
Brassica oleracea L. (Savoy Cabbage Group) · Savoy cabbage
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Citrus reticulata Blanco · Mandarin orange
Nir Carmi/Yosef Yaniv/Ahuva Frydman-Shani/Aliza Vardi/Avraham Elhanati/Kanonich Yeoshua,/Luba Fanberstein
Solanum lycopersicum L. · Tomato
Vikima Seed A.S.
Solanum lycopersicum L. · Tomato
Domaine Public (FR)
Solanum lycopersicum L. · Tomato
Johnny's Selected Seeds
Solanum lycopersicum L. · Tomato
Vilmorin-Mikado S.A.S.
Allium porrum L. · Leek
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Bavaria Saat GbR
Brassica napus var. napus · Rapeseed
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum tuberosum L. · Potato
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»
Brassica napus L. · Rapeseed
Limagrain UK
Brassica oleracea L. (Broccoli Group) · Broccoli
Bejo Zaden B.V.
Solanum lycopersicum L. · Tomato
CORA SEEDS S.R.L
Solanum lycopersicum L. · Tomato
PanAmerican Seed Europe B.V.
Brassica oleracea L. (Broccoli Group) · Broccoli
TOKITA SEED CO LTD
Daucus carota L. · Carrot
TAKII & CO LTD
Brassica oleracea L. (Broccoli Group) · Broccoli
TOKITA Sementi Italia srl
Brassica napus L. · Rapeseed
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Nirit Seeds Ltd (IL)
Solanum lycopersicum L. · Tomato
Monsanto Vegetable IP Management B.V.
Zea mays L. subsp. mays (Maize Group) · Maize
Syngenta Crop Protection AG, Seeds Division, CH