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 L. · Beet
Stupak Iryna IUriivna, Rusavskyi Vladyslav Leonidovych, Parii Myroslav Fedorovych, Parii IUliia Oleksandrivna, Yeschenko Oleksii Volodymyrovych, Parii IAroslav Fedorovych, Parii Fedir Mykytovych,
Brassica napus var. napus · Rapeseed
SYNGENTA SEEDS AG, CH
Pyrus communis L. · European pear
Spriahailo Oksana Anatoliivna, Kucher Anatolii Oleksiiovych,
Fragaria L. · Strawberry
FAEDI WALTER
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Hordeum vulgare L. · Barley
NICKERSON SEEDS
Solanum lycopersicum L. · Tomato
PETOSEED CO
Triticum aestivum L. · Bread wheat
Ebrahim Kazman
Sorghum x drummondii (Steud.) Millsp. & Chase · Sudangrass
Institut za ratarstvo i povrtarstvo, Novi Sad, Srbija
Triticum aestivum L. · Bread wheat
Bedoe Zoltan / Lang Laszlo / Veisz Otto / Vida Gyula / Szunics Laszlo / Karsai Ildiko / Rakszegi Mariann / Meszaros Klara / Szuecs Peter
Daucus carota L. · Carrot
Ger Bimsdeboer
Triticum aestivum L. · Bread wheat
Malopolska Hodowla Roslin Spolka z o.o.
Phaseolus vulgaris L. · Common bean
Vilmorin SA (FR)
Avena sativa L. · Oat
Johannes Laurson 50%, Hans Küüts 20%, Ivi Küüts 20%, Kaljo Kask 10%
Medicago sativa L. · Alfalfa
GIE GRASS (FR)
Beta vulgaris Sugar Beet Group · Sugar beet
SES ITA
Rosa L. · Rose
ALAIN ANTOINE MEILLAND (FR)
Hordeum vulgare L. · Barley
VERNEUIL SEMENCES PROVENC
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Cucurbita pepo L. · Field pumpkin
Archipiano Murielle
Cucumis sativus L. · Cucumber
Dymchenko Tetiana Mykolaivna, Muzhylko Viktor Valentynovych,
Thymus vulgaris L. · Common thyme
FALTICEANU MARCELAAMBARUS SILVICABREZEANU CREOLABREZEANU PETRE MARIAN
Beta vulgaris Sugar Beet Group · Sugar beet
DLF BEET SEED A.P.S.
Vitis vinifera L. · Common grape vine
INCONNU (FR)