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.
Hordeum vulgare L. · Barley
KWS Lochow
Hordeum vulgare L. · Barley
Syngenta UK Ltd
Hordeum vulgare L. · Barley
Nordsaat Saatzuchtgesellschaft mbH
Hordeum vulgare L. · Barley
SAATZUCHT JOSEF BREUN GMBH and CO.KG
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Hordeum vulgare L. · Barley
Syngenta UK Ltd
Lolium perenne L. · Perennial ryegrass
RAGT 2N S.A.S
Hordeum vulgare L. · Barley
Deutsche Saatveredelung, D
Festuca arundinacea Schreb. · Tall fescue
Theodorus P.M. op den Kamp
Brassica napus var. napus · Rapeseed
Werner Horn
Hordeum vulgare L. · Barley
DLF SEEDS A/S
Hordeum vulgare L. · Barley
Nickerson UK Ltd, Suffolk (UK)
Hordeum vulgare L. · Barley
SCHWEIGER IN| Georg Schweiger in Fa. Hans Schweiger & Co. (offene Handelsgesellschaft)
Hordeum vulgare L. · Barley
Secobra Recherches
Hordeum vulgare L. · Barley
Wirtschaftsgemeinschaft Gut Boldebuck GmbH % Co. KG
Hordeum vulgare L. · Barley
Poznanska Hodowla Roslin Sp. z o.o
Lolium perenne L. · Perennial ryegrass
PRODANA SEEDS A/S (DK)
Beta vulgaris Sugar Beet Group · Sugar beet
Strube, D
Spinacia oleracea L. · Spinach
Rijk Zwaan, NL
Helianthus annuus L. · Sunflower
Olivier Soulie
Daucus carota L. · Carrot
Bejo Zaden BV (NL)
Hordeum vulgare L. · Barley
Limagrain Europe, 63360 SAINT BEAUZIRE
Hordeum vulgare L. · Barley
Heen, Anders
Hordeum vulgare L. · Barley
Syngenta Participations AG