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
Danko Hodowla Roslin Sp.z.o.o.
Hordeum vulgare L. · Barley
KWS UK LTD
Brassica napus var. napus · Rapeseed
KWS SAAT SE&CO.KGaA, DE
Hordeum vulgare L. · Barley
Danko Hodowla Roslin Sp.z.o.o.
Solanum tuberosum L. · Potato
Kmetijski Inštitut Slovenije (Agricultural Institute of Slovenia)
Hordeum vulgare L. · Barley
Muranyi Istvan / Pap Miklos
Avena sativa L. · Oat
Selgen
Brassica oleracea L. (Kohlrabi Group) · Kohlrabi
BEJO ZADEN
Hordeum vulgare L. · Barley
Danko Hodowla Roslin Sp.z.o.o.
Cucumis sativus L. · Cucumber
GAVRISh SERGEJ FEDOROVICh / PORTYaNKIN ALEKSEJ EVGEN'EVICh / ShAMShINA ANNA VYaChESLAVOVNA / ShEVKUNOV VALERIJ NIKOLAEVICh
Poa pratensis L. · Kentucky bluegrass
PURE SEED TESTING
Hordeum vulgare L. · Barley
Dr. Heidi Jaiser c/o Pajbjerg A/S
Hordeum vulgare L. · Barley
UNICORN PLANT BREEDERS
Hordeum vulgare L. · Barley
NICKERSON (UK)
Arachis hypogaea L. · Peanut
S. Delikostadinov, I. Sabeva
Hordeum vulgare L. · Barley
Syngenta Crop Protection AG
Lolium perenne L. · Perennial ryegrass
JACKLIN SEED
Beta vulgaris Sugar Beet Group · Sugar beet
KUTNOWSKA HODOWLA BURAKA CUKROWEGO Sp.z o.o.
Beta vulgaris Sugar Beet Group · Sugar beet
Strube D&S GMBH
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Nicotiana tabacum L. · Tobacco
Agroport-D, H
Nicotiana tabacum L. · Tobacco
Agroport-D, H
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Instytut Ogrodnictwa - Państwowy Instytut Badawczy (The National Institute of Horticultural Research)
Helianthus annuus L. · Sunflower
CST(CLUB SELECT.TOURNESOL