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.
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Niwa Hodowla Roślin Jagodowych sp. z o.o.
Rubus idaeus L. · Red raspberry
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Prunus domestica L. · European plum
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE, DE
Hordeum vulgare L. · Barley
D-r Iorh Hrosser
Hordeum vulgare L. · Barley
CIV (NL)
Brassica napus L. · Rapeseed
LIDEA FRANCE SAS
Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage
Her Bemsdeburh
Solanum lycopersicum L. · Tomato
Mercier Jean-Claude
Solanum lycopersicum L. · Tomato
HAZERA GENETICS
Zea mays L. subsp. mays (Maize Group) · Maize
Holden Foundation Seeds Inc. (US)
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
Stefaan Horemans
Panicum miliaceum L. · Proso millet
Moshenko Mykola Mykolaiovych, Herasymenko Oleksandr Vasyl`ovych, Petrychenko Serhii Mykolaiovych, Shudria Petro Petrovych,
Lolium perenne L. · Perennial ryegrass
DSV
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Hordeum vulgare L. · Barley
Limagrain Europe, FR
Lactuca sativa L. var. crispa L. · Leaf lettuce
Horova Tamara Korniivna, Khareba Olena Vasylivna, Pozniak Oleksandr Vasyl`ovych, Kondratenko Serhii Ivanovych, Nesyn Volodymyr Mykolaiovych, Korniienko Serhii Ivanovych, Tkalych IUrii Vadymovych,
Melissa officinalis L. · Lemon balm
Brigitte Mikus-Plescher in Fa. PHARMAPLANT GmbH
Medicago sativa L. nothosubsp. varia (Martyn) Arcang. · Bastard Medic
Lutonina Mariia Mykytivna, Holub Mariia Andriivna, Bushulian Oleh Volodymyrovych,
Hordeum vulgare L. · Barley
KWS Momont Recherche Sarl
Ribes uva-crispa L. · Gooseberry
Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas
Astilbe simplicifolia Makino · Star astilbe
Mts. Holtmaat
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka