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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.

Bison

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Van der Have B.V.

DK FR LT NL PL UA
11 records

Focus

Active

Hordeum vulgare L. · Barley

SECOBRA RECHERCHES S.A.S

CZ DE DK FI FR UA
22 records

Esquire

Active

Lolium perenne L. · Perennial ryegrass

MOMMERSTEEG INTERNATIONAL

DE DK HR IT
15 records

Signora

Protection expired

Hordeum vulgare L. · Barley

SERASEM| SERASEM (G.I.E. commercial)

AT CZ DE ES FR HU +2
12 records

Jakubus

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft m.b.H. (DE)

CZ EE FR HU LT PL +1
18 records

KWS Tonic

Active

Hordeum vulgare L. · Barley

KWS LOCHOW GMBH, DE

AT CZ DE DK FR LU +1
15 records

Potomac

Active

Cucumis sativus L. · Cucumber

SEMINIS VEGETABLE SEEDS, NL

BG CZ HU IT NL PL +2
11 records

Impact

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVENV

BE CZ ES FR GR HR +1
10 records

Orthega

Protection expired

Hordeum vulgare L. · Barley

Saatzucht Lochow-Petkus (DE)

CZ DE EE HR LT PL +2
15 records

Otis

Active

Hordeum vulgare L. · Barley

VON LOCHOW PEKTUS SAATZUCHT HASSELHORST BERGEN

AT DE DK ES HR IT
16 records

Wendy

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft mbH

AT CZ DE FR HU PL +1
12 records

Angora

Active

Hordeum vulgare L. · Barley

ULRICH and JOSEF BREUN

BE DE DK FR HR HU +1
18 records

Flair

Active

Hordeum vulgare L. · Barley

Sejet Planteforµdling I/S

DK EE FI FR LT NL +1
16 records

Auriga

Active

Hordeum vulgare L. · Barley

NORDSAAT SAATZUCHT

DE EE ES FI HU LT +1
16 records

Scrabble

Active

Hordeum vulgare L. · Barley

Syngenta Seeds

CZ FI FR LT SK UA
15 records

Isabella

Application submitted

Hordeum vulgare L. · Barley

Sejet Planteforaedling I,S

DK ES FR LT PL UA
17 records

Dolina

Active

Phleum pratense L. · Timothy grass

ILVO-PLANT 39

BE CZ DK LU NL PL
15 records

Kerstin

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft mbH

AT DE EE FR LT PL
14 records

Breunskylie

Protection expired

Hordeum vulgare L. · Barley

Saatzucht Josef Breun GdbR (DE)

AT CZ DE DK FR HU
11 records

JB Flavour

Active

Hordeum vulgare L. · Barley

Saatzucht Josef Breun GdbR (DE)

CZ DE DK EE FR LT
14 records

Ingmar

Protection expired

Hordeum vulgare L. · Barley

Nordsaat Saatzucht GmbH Saatzucht Langenstein

DE DK FI LT PL UA
15 records

Amarena

Active

Hordeum vulgare L. · Barley

SAATEN UNION RECHERCHE

CZ DE FR LT PL UA
14 records

Architect

Active

Brassica napus var. napus · Rapeseed

Reinhard Hemker

CZ DE DK FR PL UA
19 records

KWS Donau

Active

Hordeum vulgare L. · Barley

KWS Lochow, D

AT CZ DE RO UA
17 records

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