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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.

Beatrix

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft mbH

AT CZ DE DK EE FI +6
26 records

Explorer

Active

Hordeum vulgare L. · Barley

VRDOLJAK GUSTAVO OMAR

CZ DE FR LT SK UA
28 records

Geronimo

Active

Poa pratensis L. · Kentucky bluegrass

Mommersteeg International BV (NL)

CZ DE EE FI FR HR +4
23 records

Endurance

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Steven D. Nelson^^^Michael D. Nelson^^^SCHMIDA DANIEL T.

ES NL PL RO SI
23 records

Ellinor

Active

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GMBH and CO.KG

AT CZ DK EE FI FR +4
27 records

Perun

Active

x Festulolium Aschers. et Graebn. · Festulolium

Slechtitelska stanice Hladke

CZ DE EE HR LT LU +2
24 records

Diamante

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

UNIVERSITY OF CALIFORNIA WOLFSKILL EXPERIMENTAL ORCHARD

ES NL PL RO
23 records

KWS Irina

Active

Hordeum vulgare L. · Barley

KWS LOCHOW GMBH, DE

CZ DE EE FI FR IE +3
28 records

Uta

Active

Hordeum vulgare L. · Barley

UNIV. PROF. DR. HERMAN HÄNSEL

CZ DE DK EE FI FR +5
25 records

Dawson

Protection expired

Festuca rubra L. · Red fescue

Mommersteeg International B.V. (NL)

CZ DE DK EE FR HR +4
21 records

Firefoxx

Active

Hordeum vulgare L. · Barley

Saaten-Union

DE DK EE FI FR LT +2
23 records

Allyance

Active

Daucus carota L. · Carrot

ROGER FREEMAN

NL UA
24 records

Cabrillo

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

UNIVERSITY OF CALIFORNIA WOLFSKILL EXPERIMENTAL ORCHARD

18 records

KWS Chrissie

Active

Hordeum vulgare L. · Barley

KWS LOCHOW GMBH, DE

CZ DE DK EE FI FR +4
22 records

Sonja

Active

Hordeum vulgare L. · Barley

W.ENGELEN

AT CZ DE DK ES FR +4
20 records

Bordeaux

Active

Hordeum vulgare L. · Barley

Nordic Seed A-S, DK

AT CZ DE DK EE FR +4
20 records

Paustian

Active

Hordeum vulgare L. · Barley

Sejet Planteforµdling I/S

DE DK EE FR IE LT +3
21 records

Accordine

Active

Hordeum vulgare L. · Barley

Saaten-Union

CZ DE FI LT LU PL +2
19 records

Kentaur

Active

Lolium perenne L. · Perennial ryegrass

Plant Breeding Hladke Zivotice, s.r.o. (CZ)

AT CZ DE FR LU PL +1
18 records

Pardus

Active

Festuca pratensis Huds. · Meadow fescue

Forschungsanstalt Agroscope Reckenholz-Tänikon ART

AT DE FI LU SI UA
16 records

KWS Asta

Terminated

Hordeum vulgare L. · Barley

KWS LOCHOW GMBH, DE

AT CZ DE DK EE FR +4
16 records

LG Zebra

Active

Hordeum vulgare L. · Barley

Limagrain UK

AT BE BG DE HU IT +3
22 records

Ivory

Active

Avena sativa L. · Oat

Saaten-Union

DE EE FI LT LU LV +1
17 records

Skyway

Active

Hordeum vulgare L. · Barley

SECOBRA RECHERCHES S.A.S

AT DE DK EE FI LT +2
20 records

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