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
Panchev IUrii Ivanovych
Solanum lycopersicum L. · Tomato
Hari Besels
Solanum lycopersicum L. · Tomato
De Ruiter Zonen (HR)
Brassica napus var. napus · Rapeseed
Jean-Claude Pruvot
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Naumov Ruslan Olehovych, Krasniuk Viacheslav Anatoliiovych,
Solanum lycopersicum L. · Tomato
Stril`nyk Halyna Vasylivna, Nedialkova Iiuliia Antonivna, Horkutsenko Oleksandr Vasyl`ovych, Kravchenko Vladyslav Andriiovych, Shotyk Mykola Vasyl`ovych,
Solanum lycopersicum L. · Tomato
Sytnychenko Serhii Mykolaiovych
Solanum lycopersicum L. · Tomato
Hari Besels
Solanum lycopersicum L. · Tomato
Her Bimsdeboer
Solanum lycopersicum L. · Tomato
Zuhair Bibi
Brassica napus L. · Rapeseed
PHYCOMAT EURL
Zinnia elegans Jacq. · Common zinnia
CNOS Przedsiebiorstwo Nasiennictwa Ogrodniczego sp. z o.o.
Helianthus annuus L. · Sunflower
Avramenko Oleksandr Oleksandrovych , Scherban` Nataliia Fedorivna, Scherban` Serhii Vasyl`ovych,
Solanum lycopersicum L. · Tomato
Hari Besels
Daucus carota L. · Carrot
Daniel Gabillard
Brassica napus var. napus · Rapeseed
SYNGENTA SEEDS AG, CH
Daucus carota L. · Carrot
Ger Bimsdeboer
Solanum lycopersicum L. · Tomato
Horkutsenko Oleksandr Vasyl`ovych, Nedialkova Iiuliia Antonivna, Stril`nyk Halyna Vasylivna, Shotyk Mykola Vasyl`ovych,
Solanum tuberosum L. · Potato
Sharapa Liubov Panasivna, Dan`ko Heorhii Vasyl`ovych, Manoilo Halyna Vasylivna, Khomenko Larysa Dmytrivna, Petrenko Kateryna Oleksandrivna, Onyshcenko Oleh Fedorovych,
Solanum tuberosum L. · Potato
Siharova Dina Dmytrivna, Sobran Ivan Vasyl`ovych, Tomash Anatolii Ivanovych, Borivs`kyi Anatolii Frantsovych, Cherednychenko Liubov Mykolaivna, Taktaiev Borys Anatoliiovych, Nazar Stefaniia Hryhorivna, Osypchuk Alla Andriivna, Furdyha Mykola Mykolaiovych,
Daucus carota L. · Carrot
Ger Beemsterboer
Citrus reticulata Blanco · Mandarin orange
VARIOS OBTENTORES
Daucus carota L. · Carrot
Ger Bimsdeboer
Daucus carota L. · Carrot
Ger Beemsterboer