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.
Lolium perenne L. · Perennial ryegrass
Peak Plant Genetics, LLC & Rutgers, The State University of New Jersey
Hordeum vulgare L. · Barley
Sejet Planteforaedling, DK-8700 Horsens
Poa pratensis L. · Kentucky bluegrass
Pickseed USA
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
University of California, Plant Sciences, Davis / University of California, Plant Sciences, Davis
Anigozanthos Labill. · Kangaroo Paw
Ramm Botanicals Holdings Pty Ltd
Zea mays L. · Maize
PIONEER HI-BRED INTERNATIONAL
Zea mays L. · Maize
PIONEER HI-BRED INTERNATIONAL
Cercis canadensis L. · Eastern redbud
Werner Dennis James / Snelling Layne Karlton
Pelargonium peltatum (L.) L'Hér. · Ivy-leaf geranium
Martin Geibel c/o Elsner pac Jungpflanzen GbR
Rosa L. · Rose
Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes
Citrus L. · Citrus
Frutas Beltran S.L.
Zea mays L. · Maize
PETER KONCZOL
Hordeum vulgare L. · Barley
Zymohliad Oleksii Viktorovych, Solonechnyi Pavlo Mykolaiovych, Naumov Oleksii Hermanovych, Vasko Nataliia Ivanivna, Kozachenko Mykhailo Romanovych,
Trifolium incarnatum L. · Crimson clover
Malopolska Hodowla Roslin Spolka z o.o.
Hordeum vulgare L. · Barley
W VON BORRIES-ECKENDORF GMBH & CO. KOMMANDITGESELLSCHAFT
Avena sativa L. · Oat
Lochow-Petkus GmbH (DE)
Hordeum vulgare L. · Barley
PLANT SELECT, SPOL. S R.O.
Hordeum vulgare L. · Barley
Syngenta Participations AG
Glycine max (L.) Merr. · Soybean
STINE SEED Co, USA
Hordeum vulgare L. · Barley
Herasymova Anastasiia Ivanivna, Suprunenko Viktoriia Mykolaivna, Levshtanov Serhii Oleksandrovych, Ostanina Tamara Vitaliivna, Sukhorada Oleksii Ivanovych, Kremzina Ol`ha Mykhailivna, Vasiukov Pavlo Petrovych, Kuznietsova Tamara IEvheniivna, Serkin Mykola
Hordeum vulgare L. · Barley
Apsovsementi S.p.A., CREA-GB
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Brassica napus var. napus · Rapeseed
Gunhild Leckband Dieter Stelling
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA