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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.

Sources10

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

Barley 509 Sugar beet 487 Tomato 250 Perennial ryegrass 167 Cucumber 160 Garden strawberry 123 Bread wheat 105 Rapeseed 80 Tall fescue 79 Kentucky bluegrass 76 Maize 66 Carrot 59

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.

SU Perspectiv

Active

Secale cereale L. · Rye

Saaten-Union

CZ DE DK EE FI LV +2
17 records

LG Casting

Active

Hordeum vulgare L. · Barley

Mark Glew

BG DK FR HU IE PL +2
18 records

Promesse

Active

Phleum pratense L. · Timothy grass

VEREDELINGSBERIJF

EE FR LT LU LV NL +2
17 records

Bariris

Active

Poa pratensis L. · Kentucky bluegrass

H.J.M. Barenbrug

CZ DE HR HU NL PL +2
17 records

Akratos

Active

Triticum aestivum L. · Bread wheat

Strube Research GmbH & Co. KG, D- 38387 Sollingen

EE FR HR LT SE UA
14 records

KWS Cantton

Active

Hordeum vulgare L. · Barley

SCHINKEL BURKHARD

DE DK FI IE PL UA
14 records

Diamante

Active

Fragaria L. · Strawberry

The Regents of the University of California

BG CZ HU SK
14 records

Brillyance

Active

Daucus carota L. · Carrot

Robert Oostveen

NL UA
19 records

Avalon

Active

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GmbH&Co.KG

CZ DE EE FI FR LT +2
20 records

Coyote

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE| SESVANDERHAVE N.V./S.A. Industriepark

BE CZ DE ES HR IT +2
11 records

Narbonne

Active

Daucus carota L. · Carrot

Bejo Zaden B.V.

BG CZ HU LT NL PL +2
12 records

Baikal

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Maribo Seed International ApS, DK

FR GR HR HU NL PL +1
12 records

KWS Higgins

Active

Hordeum vulgare L. · Barley

KWS Lochow

AT CZ DE FI LT LU +2
17 records

Sanette

Active

Hordeum vulgare L. · Barley

Syngenta UK Ltd

CZ DK EE FR IE LT +1
17 records

Bargold

Active

Lolium perenne L. · Perennial ryegrass

Barenbrug Holland BV (NL)

CZ DE DK FR HU NL +2
15 records

Mokum

Active

Daucus carota L. · Carrot

Bejo Zaden BV, NL-1749 ZH Warmenhuizen

CZ HR HU LT NL SI +1
12 records

Panduro

Active

Poa pratensis L. · Kentucky bluegrass

DLF Seeds A/S, Dansk Planteforedling (DK)

CZ DE EE HR LT PL +1
13 records

Lexy

Active

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GMBH and CO.KG

DE EE FI FR LT PL +1
22 records

Pablo

Active

Beta vulgaris Garden Beet Group · Garden beet

Bejo Zaden BV (NL)

BG CZ HR HU LT NL +1
11 records

Marmota

Active

Lolium x hybridum Hausskn. · Hybrid ryegrass

Forschungsanstalt fur Agrarokologie und Landwirtschaft, CH-8046 Zurich

AT CZ DE DK FR LU +1
15 records

Gator

Active

Lolium perenne L. · Perennial ryegrass

INTERNATIONAL SEEDS INC

CZ DE EE FR HU PL +1
18 records

Forono

Active

Beta vulgaris Garden Beet Group · Garden beet

Syngenta Seeds B.V.

CZ DE DK HU NL PL +1
13 records

Baronial

Active

Poa pratensis L. · Kentucky bluegrass

BARENBRUG HOLLAND| Barenbrug Holland B.V. (Variety Administration)

CZ DE DK FI HU SK +1
14 records

Regal

Active

Cucumis sativus L. · Cucumber

HM.CLAUSE

CZ HU LT NL PL SI
12 records

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