Diseases
Leaf spot diseases are a group of fungal, bacterial, or viral disorders manifesting as tissue necrosis in the form of spots of various shapes and colors. Pathogen development leads to a reduction in photosynthetic leaf area, tissue deformation, and significant yield losses.
Mentioned in descriptions 15 926 varieties reference book.
Leaf spot diseases represent a collective group of conditions caused by fungi, bacteria, or viruses. The primary diagnostic symptom is the formation of spots of various colors—brown, yellow, black, or gray—on the leaf blades, ranging from small dots to extensive necrotic lesions with or without margins. Infection often originates in the lower leaf canopy and, if allowed to develop, leads to premature defoliation and overall plant weakening.
Disease progression depends on a combination of favorable meteorological factors, such as moderately warm temperatures and high humidity, as well as the agrotechnical background. Improper crop rotation and the retention of crop residues in fields contribute to the accumulation of inoculum and intensive infection of crops in subsequent seasons. The severity of disease manifestation correlates directly with pathogen aggressiveness and the degree of cultivar susceptibility, which can lead to a 20–30% or greater reduction in crop productivity.
Cultivar resistance to leaf spots is a genetically determined ability to maintain productivity under disease pressure. It can be specific, targeting particular pathogen races, or non-specific polygenic, providing complex protection. Resistance mechanisms include physical barriers, such as waxy coatings, and biochemical responses. During variety testing, resistance is evaluated under natural and artificial inoculation conditions using scoring scales to record the degree of necrosis and pathogen development.
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 napus L. · Rapeseed
Holubiev Kostiantyn Viktorovych, Parii Myrosla Fedorovych,
Helianthus annuus L. · Sunflower
Reva IAroslav Mykolaiovych
Hordeum vulgare L. · Barley
Vasko Nataliia Ivanivna, Didenko Svitlana Yuriivna, Solonechnyi Pavlo Mykolaiovych, Vazhenina Olha Yevheniivna, Naumov Oleksii Hermanovych, Kozachenko Mykhailo Romanovych
Hordeum vulgare L. · Barley
RAGT 2n, FR
Hordeum vulgare L. · Barley
Yankovs`kyi Mykola Hryhorovych, Yankovs`kyi Mykola Hryhorovych, Derov Anatolii Ivanovych, Ihnat"eva Nataliia Hennadiivna, Kovalenko Liudmyla Mykolaivna, Filippov IEvhenii Hryhorovych, Matviievs`ka Nataliia Ivanivna, Serebrians`ka Vira Pavlivna, Sokol Teti
Hordeum vulgare L. · Barley
Derov Anatolii Ivanovych, Ihnat`ieva Nataliia Henadiivna, Kovalenko Liudmyla Mykolaivna, Matviienko Nataliia Ivanivna, Sokol Tetiana Vasylivna, Serebrians`ka Vira Pavlivna, Sokol Oleksandr Andriiovych,
Hordeum vulgare L. · Barley
Markova Tetiana IUriivna, Fedorenko Vira Oleksandrivna, Naumov Oleksii Hermanovych, Vasko Nataliia Ivanivna, Kozachenko Mykhailo Romanovych,
Hordeum vulgare L. · Barley
KOCHMARSKYI VALENTYN, HUDZENKO VOLODYMYR, DEMYDOV OLEKSANDR, POLISCHUK TETIANA, BOBYR OLHA
Hordeum vulgare L. · Barley
Hudzenko, Volodymyr Babii, Olha Demydov, Oleksandr Polishcuk, Tetiana
Hordeum vulgare L. · Barley
Lysenko Anna Anatoliivna, Demydov Oleksandr Anatoliiovych, Polishcuk Tetiana Petrivna, Hudzenko Volodymyr Mykolaiovych,
Hordeum vulgare L. · Barley
Taran Oleksandr Oleksandrovych, Polischuk Tetiana Petrivna, Vasylenko Nadiia Vasylivna, Hudzenko Volodymyr Mykolaiovych, Kochmars`kyi Valentyn Serhiiovych,
Hordeum vulgare L. · Barley
Lochow-Petkus GmbH (DE)
x Triticosecale Wittm. ex A. Camus · Triticale
Kyrylchuk Anzhela Mykolaivna, Starychenko Vasyl Mykolaiovych, Kovalchuk Serhii Oleksandrovych
Hordeum vulgare L. · Barley
D-r Iorh Hrosser
Brassica napus var. napus · Rapeseed
Kalinichenko Artem Oleksandrovych, Didenko Kostiantyn Oleksandrovych,
Zea mays L. · Maize
Mima Ilchovska, Valya Bachiyska
Zea mays L. · Maize
Golden West Research Ltd (BG)
Pisum sativum L. · Pea
Lietuvos žemės ūkio universitetas
Brassica oleracea L. (White Cabbage Group) · White cabbage
P.J. Struik
Hordeum vulgare L. · Barley
SEMSECO (FR)
Daucus carota L. · Carrot
Ger Bimsdeboer
Hordeum vulgare L. · Barley
Kuz`menko Halyna Iosypivna, Vlasenko Volodymyr Anatoliiovych, Shubenko Nadiia Petrivna, Shubenko Ivan Andriiovych,
Brassica napus L. · Rapeseed
SEMUNDO SAATZUCHT GMBH
Helianthus annuus L. · Sunflower
A. Piskov, P. Ivanov, I. Ivanova, P. Petrov, P. Shindrova, M. Hristov, D. Petakov, V. Encheva, L. Nikolova, G. Georgiev