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.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
Kuhn en Co. International B.V.
Nicotiana tabacum L. · Tobacco
Angel I. Manolov, Hristos D. Georgiev, Stefka K. Mincheva, Mitko A. Slavkov
Solanum lycopersicum L. · Tomato
WESTERN SEED ESPAÑA, S.A.
Avena sativa L. · Oat
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Beta vulgaris Fodder Beet Group · Mangelwurzel
Malopolska Hodowla Roslin Spolka z o.o.
Olea europaea L. · Olive
Beta vulgaris Fodder Beet Group · Mangelwurzel
Malopolska Hodowla Roslin Spolka z o.o.
Lactuca sativa L. · Lettuce
Domaine Public (FR)
Brassica napus var. napus · Rapeseed
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Hordeum vulgare L. · Barley
Puskas Arpad / Adorjan Roza / Szabo Erzsebet / Bosnyak Imre / Nagy Tuende / Koczka Balintne / Gyoeri Zoltan / Czimbalmas Agnes
Beta vulgaris Fodder Beet Group · Mangelwurzel
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Beta vulgaris Garden Beet Group · Garden beet
Hodowla Roslin Snowidza Sp.z.o.o
Solanum lycopersicum L. · Tomato
Bejo Zaden B.V.
Prunus cerasus L. · Sour cherry
Beta vulgaris Sugar Beet Group · Sugar beet
WIELKOPOLSKA HODOWLA BURAKA CUKROWEGO SP.Z.O.O
Beta vulgaris Sugar Beet Group · Sugar beet
Khermann Shtrube
Beta vulgaris Sugar Beet Group · Sugar beet
KUTNOWSKA HODOWLA BURAKA CUKROWEGO Sp.z o.o.
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Seeds
Solanum lycopersicum L. · Tomato
Vilmorin-Mikado S.A.S.
Cucumis sativus L. · Cucumber
SAKATA VEGETABLES EUROPE SAS
Phaseolus vulgaris L. · Common bean
TERZOLO GIOACHINO
Solanum lycopersicum L. · Tomato
Sakata Vegetables Europe S.A.S
Beta vulgaris Sugar Beet Group · Sugar beet
KUTNOWSKA HODOWLA BURAKA CUKROWEGO Sp.z o.o.