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 Fodder Beet Group · Mangelwurzel
Malopolska Hodowla Roslin Spolka z o.o.
Apium graveolens L. var. rapaceum (Mill.) Gaud. · Celeriac
J. Wagner (DE)
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Hordeum vulgare L. · Barley
Heinrich Busch^^^HERRMANN MANFRED
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE&CO.KGaA, DE
Beta vulgaris Sugar Beet Group · Sugar beet
KWS, D
Cucumis sativus L. · Cucumber
Zoldesegtermesztesi Kutato Intezet RT (HU)
Cucumis sativus L. · Cucumber
NUNHEMS
Beta vulgaris Sugar Beet Group · Sugar beet
MariboHilleshög ApS
Beta vulgaris Sugar Beet Group · Sugar beet
MariboHilleshög ApS
Brassica napus var. napus · Rapeseed
Dieter Stelling, Jurgen Noack, Martin Frauen,
Beta vulgaris Sugar Beet Group · Sugar beet
SAS FLORIMOND-DESPREZ Veuve et Fils
Beta vulgaris Sugar Beet Group · Sugar beet
WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O
Beta vulgaris Garden Beet Group · Garden beet
L. DÆHNFELDT A/S
Hordeum vulgare L. · Barley
Saatzucht Donau GmbH & Co.KG
Hordeum vulgare L. · Barley
Pajbjergfonden (DK)
Prunus persica (L.) Batsch · Peach
Beta vulgaris Sugar Beet Group · Sugar beet
SAS FLORIMOND-DESPREZ Veuve et Fils
Zea mays L. · Maize
PIONEER OVERSEAS CORPORATION
Hordeum vulgare L. · Barley
Boreal Plant Breeding
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE&CO.KGaA, DE
Beta vulgaris Sugar Beet Group · Sugar beet
Strube-Dieckmann GmbH and Co.KG Dr. Hermann Strube
Triticum aestivum L. · Bread wheat
SAATEN UNION RECHERCHE
Beta vulgaris Sugar Beet Group · Sugar beet
Strube D&S GMBH