Grand Slam 2
ActiveLolium perenne L. · Perennial ryegrass
PURE SEED TESTING
ES
5 records
Diseases
Leaf spot 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.
Breakdown by crop
Rose leaf spots
789
Tomato Leaf Spots
563
Barley Leaf Spot Diseases
541
Pepper Leaf Spots
277
Cucumber leaf spots
244
Leaf blotch — soft wheat
239
Leaf spots — Perennial ryegrass
181
Leaf spots — garden strawberry
141
Bean leaf spots
139
Leaf spots — tall fescue
125
Potato early blight
123
Peach Leaf Spots
120
Leaf spots of summer squash
107
Leaf Spot — Kentucky Bluegrass
105
Apple Leaf Spot
95
Maize leaf spots
82
Melon Leaf Spot
74
Olive leaf spot
71
Leaf spots — Creeping bentgrass
53
Carrot leaf blights
48
Leaf spots of red fescue
43
Maize leaf spots
35
Plum leaf spots
34
Triticale leaf spots
32
Found in these crops
Varieties that feature this in their description
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.
El Giga
ActiveSpinacia oleracea L. · Spinach
Syngenta Crop Protection AG
NL
8 records
Wendy's Wish
ActiveSalvia L. · Sage
Wendy Smith
LH 200
ActiveZea mays L. · Maize
HOLDEN'S FOUNDATION SEEDS INC.
Dk 537
ActiveZea mays L. · Maize
Dekalb Genetics Corporation
HU
IT
SK
8 records
TY 12
ActiveSolanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.^^^Asahi Industries Co. Ltd.
NL
UA
5 records
BTS 2045
ActiveBeta vulgaris Sugar Beet Group · Sugar beet
Betaseed Inc. (US)
DE
FR
4 records
Heinz 2206
ActiveSolanum lycopersicum L. · Tomato
HEINZSEED
HR
PT
5 records
Heinz 1301
ActiveSolanum lycopersicum L. · Tomato
HEINZSEED
PT
UA
4 records
Wild Horse
ActivePoa pratensis L. · Kentucky bluegrass
PROSEEDS MARKETING
IT
5 records
UF 950
ActiveCitrus reticulata Blanco · Mandarin orange
Gmitter, JR. Frederick G.
ES
5 records
SR 4600
ActiveLolium perenne L. · Perennial ryegrass
Seed Research of Oregon & Rutgers, The State University of New Jersey
IT
4 records
Opti-green
ActivePoa pratensis L. · Kentucky bluegrass
PURE SEED TESTING
DE
6 records
NC - 7
ActiveArachis hypogaea L. · Peanut
North Carolina Agricultural Research Service
CY
5 records
Blue Star
ActivePoa pratensis L. · Kentucky bluegrass
PURE SEED TESTING
IT
6 records
Ct-7
ActiveLolium perenne L. · Perennial ryegrass
Novel AG
PL
4 records
Autumn Blush
ActiveCoreopsis L. · Tickseed
TERRA NOVA NURSERIES INC
FLR14-372
ActiveVaccinium corymbosum L. · Highbush blueberry
Rústicas del Guadalquivir S.L.^^^Florida Foundation Seed Producers Inc. (FFSP Marianna Office)
RGT Planet
ActiveHordeum vulgare L. · Barley
Ragt, F
AT
CZ
DE
DK
EE
FI
+8
45 records
Conchita
ActiveHordeum vulgare L. · Barley
SCHINKEL BURKHARD
AT
DE
DK
EE
FI
FR
+7
35 records
Ventana
ActiveFragaria x ananassa Duchesne ex Rozier · Garden strawberry
The Regents of the University of California
ES
HU
NL
PL
RO
30 records
Laureate
ActiveHordeum vulgare L. · Barley
Syngenta UK Ltd
AT
CZ
DE
EE
FI
FR
+7
35 records
Boléro
ActiveDaucus carota L. · Carrot
Vilmorin, F
BG
CZ
FR
HR
HU
PL
+2
20 records
Traveler
ActiveHordeum vulgare L. · Barley
Secobra, F
CZ
DE
FR
LT
UA
28 records