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.
Daucus carota L. · Carrot
Bakker Brothers Gebroeders Bakker Zaadteelt en Zaadhandel BV
Solanum lycopersicum L. · Tomato
Western Seed International B.V.
Solanum lycopersicum L. · Tomato
Pro-Veg Seeds Ltd. Unit N Peek House, Dales Manor Business Park
Brassica napus var. napus · Rapeseed
Hodowla Roslin Smolice Sp.z o.o Grupa IHAR
Brassica napus var. napus · Rapeseed
GORShKOV VLADIMIR IVANOVICh / KARPAChEV VLADIMIR VLADIMIROVICh / VLASOVA AL'BINA NIKOLAEVNA / MANAENKOV SERGEJ IVANOVICh
Citrus reticulata Blanco · Mandarin orange
Nir Carmi^^^Yoram Eyal^^^Hanna Neuman-Leshem^^^Ahuva Frydman-Shani^^^Aliza Vardi^^^Avraham Elhanati^^^Yosef Yaniv^^^Yeoshua Kanonich^^^Luba Fanberstein
Brassica oleracea L. (White Cabbage Group) · White cabbage
Bejo Zaden B.V.
Daucus carota L. · Carrot
Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas
Brassica oleracea L. (Broccoli Group) · Broccoli
INTERSEMILLAS SAU
Solanum lycopersicum L. · Tomato
Bayer Holland B.V.
Solanum tuberosum L. · Potato
HERMEZIU RADU
Solanum lycopersicum L. · Tomato
SAKATA SEED AMERICA INC US
Allium cepa L. var. cepa · Onion
Bayer Holland B.V.
Daucus carota L. · Carrot
TAKII EUROPE B V
Daucus carota L. · Carrot
Lietuvos agrarinių ir miškų mokslų centras
Citrus reticulata Blanco · Mandarin orange
IVIA
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Daucus carota L. · Carrot
Seminis Vegetable Seeds
Brassica napus L. · Rapeseed
Limagrain UK
Solanum lycopersicum L. · Tomato
Harutyan Manuelyan, Milko Stoyanov, Galina Pevicharova, Daniela Ganeva, Zizi Stoyanova, Nevena Todorova
Solanum lycopersicum L. · Tomato
Bejo Zaden B.V.
Solanum lycopersicum L. · Tomato
PETOSEED CO
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation, JP
Solanum tuberosum L. · Potato
WALLMUELLER| Walter Wallmueller