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.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Eucomis L’Her. · Pineapple lily
Janet N. Egger
Ligustrum obtusifolium Siebold & Zucc. · Amur privet
Instituut voor Landbouw- en Visserijonderzoek (ILVO) Eenheid Plant
Campanula L. · Bellflower
BURPEE NL B.V.
Primula vulgaris Huds. · Primrose
Arie Van Diepen
Helleborus orientalis Lam. · Lenten rose
Hendrik Meijer
Beta vulgaris Sugar Beet Group · Sugar beet
WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O
Beta vulgaris Sugar Beet Group · Sugar beet
WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Lolium perenne L. · Perennial ryegrass
Seed Research of Oregon & Rutgers, The State University of New Jersey
Hordeum vulgare L. · Barley
SERKIN NIKOLAJ VIKTOROVICh / ShEVTSOV VIKTOR MIHAJLOVICh / KUZNETSOVA TAMARA EVGEN'EVNA / GRUNTSEV YuRIJ ALEKSANDROVICh / VASYuKOV PAVEL PETROVICh / KREMZINA OL'GA MIHAJLOVNA / FOMENKO NINA PANTELEEVNA / OSTANINA TAMARA VITAL'EVNA / ChUMAK VASILIJ MIHAJL
Beta vulgaris Sugar Beet Group · Sugar beet
Strube, D
Festuca trachyphylla (Hack.) Hack. · Hard fescue
DEUTSCHE SAATVEREDELUNG AG
Lolium multiflorum Lam. ssp. italicum (A. Br.) Volkart · Italian ryegrass
Limagrain Verneuil Holding (FR)
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Beta vulgaris L. · Beet
keine Angabe
Cucumis sativus L. · Cucumber
Bayer Holland B.V.
Hordeum vulgare L. · Barley
KWS Lochow
Beta vulgaris L. · Beet
SESVanderhave NV
Avena sativa L. · Oat
Ilmar Tamm 45%, Johannes Laurson 35%, Hans Küüts 15%, Kaljo Kask 5%
Hordeum vulgare L. · Barley
Poznanska Hodowla Roslin Sp. z o.o
Cucumis sativus L. · Cucumber
INTERSEMILLAS SAU