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.
Triticum aestivum L. · Bread wheat
Anne Ingver 20%, Merlin Haljak 10%, Reine Koppel 70% Centre of Estonian Rural Research and Knowledge
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation (SCC)
Lolium perenne L. · Perennial ryegrass
PROSEEDS MARKETING
Beta vulgaris Garden Beet Group · Garden beet
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Avena nuda L. · Naked oat
SELGEN A.S
Poa pratensis L. · Kentucky bluegrass
University of Minnesota (US)
Lolium perenne L. · Perennial ryegrass
PROSEEDS MARKETING
Beta vulgaris Sugar Beet Group · Sugar beet
Sesvanderhave, B
Lolium perenne L. · Perennial ryegrass
RUTGERS UNIVERSITY OF NEW JERSEY
Brassica napus var. napus · Rapeseed
Serasem S.A.S.
Zea mays L. · Maize
PIONEER OVERSEAS CORPORATION
Daucus carota L. · Carrot
BEJO ZADEN
Hordeum vulgare L. · Barley
Lietuvos agrarinių ir miškų mokslų centro filialas Žemdirbystės institutas
Ribes uva-crispa L. · Gooseberry
V. Kopan c/o Institute of Horticulture Research Centre
Hordeum vulgare L. · Barley
Poznanska Hodowla Roslin Sp. z o.o
Poa pratensis L. · Kentucky bluegrass
Jacklin Seed Company
Hordeum vulgare L. · Barley
Nordic Seed A/S
Festuca rubra L. · Red fescue
TURF SEED EUROPE LTD
Avena sativa L. · Oat
Zoltán Bedő^^^László Láng^^^Ottó Veisz^^^Gyula Vida^^^Szilvia Bencze^^^Balázs Varga
Brassica napus var. napus · Rapeseed
Limagrain Europe S.A.S
Oryza sativa L. · Rice
LUGANO LEONARDO SRL
Solanum lycopersicum L. · Tomato
Bejo Zaden B.V.
Solanum lycopersicum L. · Tomato
Bejo Zaden B.V.