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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.

Pht11*Phr61

Terminated

Zea mays L. · Maize

PIONEER HI-BRED INTERNATIONAL

1 record

Raspberry Tart

Withdrawn

Echinacea Moench. · Coneflower

HARINI KORLIPARA

2 records

Opal

Application submitted

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Jonathan R. Nelson^^^Jeffrey D. Nelson^^^Daniel S. Nelson^^^Scott C. Nelson

1 record

Orcane

Active

Populus x canadensis Moench · Carolina poplar

Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE) , Institut Technologique FCBA, Institut National de Recherche en Sciences et Technologies pour l’Environnement et l’Agriculture (IRSTEA)

1 record

Oxford

Terminated

Hordeum vulgare L. · Barley

Nickerson International Research S.N.C.

1 record

Okura Red

Terminated

Chrysanthemum L. · Chrysanthemum

PARATY B.V.B.A

1 record

MINSYGRABL1

Active

Hibiscus syriacus L. · Rose of Sharon

Hortival Diffusion S.A.S.

1 record

Lunika

Active

Allium cepa L. var. cepa · Onion

CORA SEEDS S.R.L

2 records

Lemon Puff

Active

Leucanthemum x superbum (Bergmans ex J. W. Ingram) D. H. Kent · Shasta daisy

HARINI KORLIPARA

1 record

Little Flame

Active

Leucothoe axillaris x Leucothoe fontanesiana

FA Duyndam V.O.F.

1 record

Little Fenna

Active

Photinia x fraseri Dress · Fraser's photinia

Fa. J.C. Niesing V.O.F.

1 record

Lilliput

Terminated

Penstemon Schmidel. · Beard Tongue

A T Yates & Son

1 record

Katja

Terminated

Phlox paniculata L. · Garden phlox

Geerlings-Meyer

1 record

Katana

Active

Yucca gloriosa L. var. recurvifolia (Salisb.) Engelm. x Y. linearifolia Clary

Frédéric Julien

1 record

Kerbeldawn

Terminated

Primula vulgaris Huds. · Primrose

Priscilla Grace Kerley^^^Timothy Edward Kerley^^^Sarah Elisabeth Kerley^^^David William Kerley

1 record

Ischia

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

C.I.V. - Consorzio Italiano Vivaisti - Società Agricola Consortile a r.l.

2 records

Kolmajo

Terminated

Symphoricarpos x doorenbosii Krüssm. · Coralberry

Floribreed V.O.F.

1 record

Kolmades

Terminated

Hypericum x inodorum Mill. · Tall tutsan

Floribreed V.O.F.

1 record

HGI1068

Terminated

Impatiens walleriana Hook. f. · Busy Lizzie

Hem Genetics Research B.V.

1 record

JBN 12002

Terminated

Hibiscus rosa-sinensis L. · Chinese hibiscus

James Berry

1 record

Kolmarrho

Active

Symphoricarpos x doorenbosii Krüssm. · Coralberry

Floribreed V.O.F.

1 record

Firecracker

Active

Digitalis chalcantha (Svent. & O'Shan.) Albach et al. x Digitalis grandiflora Mill.

Hans A. Hansen

1 record

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