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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.

Linus

Terminated

Hordeum vulgare L. · Barley

Verneuil Recherche SA (FR)/Svalof Weibull AB (SE)

DE DK EE FR PL SE
15 records

Jivet

Active

Lolium multiflorum Lam. · Italian ryegrass

Plant Breeding Hladke Zivotice

DE SK
16 records

Ben Alder

Active

Ribes nigrum L. · Blackcurrant

SCRI / DAFS

DE DK LT NL PL SE
16 records

Teuto

Active

Hordeum vulgare L. · Barley

Secobra Saatzucht

DE DK LU PL UA
12 records

Chariot

Active

Hordeum vulgare L. · Barley

PLANT BREEDING INTERNATIONAL

BE DE DK ES FR IE
17 records

Ténor

Active

Triticum aestivum L. · Bread wheat

Unisigma GIE Recherche et Selection (FR)

FR HR IT PT UA
19 records

Sydney

Active

Hordeum vulgare L. · Barley

SAATZUCHT STRENG-ENGELEN GMBH&CO. KG

DE EE LT LU PL
10 records

SU Midnight

Active

Hordeum vulgare L. · Barley

W.von Borries-Eckendorf, D

AT CZ DE PL UA
13 records

Lifema

Active

x Festulolium Aschers. et Graebn. · Festulolium

FEUERSTEIN ULF / STELLING DIETER

DE DK FR LU UA
13 records

KWS Cassia

Active

Hordeum vulgare L. · Barley

KWS UK LTD

AT DE FR IE LV
12 records

Comer

Active

Phleum pratense L. · Timothy grass

Rijksstation Voor Plantenveredeling (BE)

AT BE DE FR NL
17 records

Bikores

Active

Beta vulgaris Garden Beet Group · Garden beet

Ger Bimsdeboer

HR HU NL PL UA
9 records

Barlexas II

Active

Festuca arundinacea Schreb. · Tall fescue

Barenbrug Holland BV (NL)

CZ FR HR IT RO
11 records

Bravo

Active

Beta vulgaris Sugar Beet Group · Sugar beet

STRUBE HERMANN| Dr. Hermann Strube

DE FR LT PL UA
10 records

Tisel

Active

Ribes nigrum L. · Blackcurrant

Research Institute of Pomology and Floriculture

CZ PL SK UA
18 records

Sunset

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

The Regents of the University of California (US)

ES FR NL PT
17 records

Mustang

Active

Festuca arundinacea Schreb. · Tall fescue

Pickseed West Inc. (USA)

DE HR SI UA
11 records

Espada

Active

Phaseolus vulgaris L. · Common bean

Harris Moran Seed Company

HU NL PL SK
10 records

Deltastar

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

CZ NL PL SK
9 records

Naval

Active

Daucus carota L. · Carrot

Ger Beemsterboer

HR NL UA
9 records

Jamboree

Active

Festuca arundinacea Schreb. · Tall fescue

DLF-TRIFOLIUM DANSK PLANTEFORAEDLING

DK FR IT
12 records

Jerada

Active

Daucus carota L. · Carrot

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL UA
10 records

Essential

Active

Festuca arundinacea Schreb. · Tall fescue

DLF-TRIFOLIUM DANSK PLANTEFORAEDLING

FR IT
13 records

Berlin

Active

Daucus carota L. · Carrot

Ger Beemsterboer

NL UA
11 records

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