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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.

HLR 200

Terminated

Helleborus x hybridus hort. ex Voss · Lenten rose

Nis van der Horst

1 record

Double Dynamite

Active

Lagerstroemia indica L. · Crape myrtle

Carl Whitcomb

1 record

Dixie S

Terminated

Echinacea Moench. · Coneflower

HARINI KORLIPARA

1 record

Dixie B

Terminated

Echinacea Moench. · Coneflower

HARINI KORLIPARA

1 record

El Jaro 281

Active

Eucalyptus globulus Labill. · Tasmanian blue gum

Administración Concursal Sniace S.A.

1 record

Elegance

Terminated

Hybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton

HARINI KORLIPARA

1 record

CS2012-12

Withdrawn

Lagerstroemia indica L. · Crape myrtle

James Berry

1 record

Branpara

Terminated

Photinia glabra (Thunb.) Franch. & Sav. · Japanese photinia

Robert J Cherry

1 record

Changeling

Application submitted

Heuchera americana L. · alumroot

John C. Pavlich

1 record

Darius

Withdrawn

Chaenomeles japonica (Thunb.) Lindl. ex Spach · Japanese quince

Kimmo Rumpunen^^^Silvija Ruisa^^^Darius Kviklys

1 record

Balsomselo

Terminated

Hybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton

Jianping Ren

1 record

Colorburst Orange

Withdrawn

Hybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton

HARINI KORLIPARA

1 record

ANNYS2020

Active

Ilex x meserveae S. Y. Hu · Meserve holly

ANDRE VAN NIJNATTEN

1 record

Balroxleam

Withdrawn

Digitalis x fulva Lindl.

Paul Gehrke

1 record

Boston Cherries

Terminated

Begonia-Rex-Hybridae · King begonia

BOOMAN JAMES LAWRENCE

1 record

Bravor

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Flevo Plant Holding B.V.

1 record

Astilbe Eliblo

Protection expired

Astilbe Buch.-Ham. ex D. Don · False goat's beard

Blooms of Bressingham Ltd

1 record

Balsomsolst

Terminated

Hybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton

Jianping Ren

1 record

1LI

Withdrawn

Lagerstroemia indica L. · Crape myrtle

James Berry^^^Capstone Plants Inc.

1 record

#18LI

Active

Lagerstroemia indica L. · Crape myrtle

James Berry^^^Capstone Plants Inc.

1 record

Zhaklin

Active

Glycine max (L.) Merr. · Soybean

BOLBOTENKO NADIIA OLEKSANDRIVNA, ROMANIUK LIDIIA SERHIIVNA, SHCHERBYNA OLENA ZINOVIIVNA, TYMOSHENKO OLEKSANDR OLEKSIIOVYCH, POLISHCHUK SVITLANA VIKTORIVNA, SHOSTAK NATALIIA OLEKSANDRIVNA, MYKHAILOV VIACHESLAV HRYHOROVYCH

UA
2 records

Ūla

Terminated

Hordeum vulgare L. · Barley

Lietuvos agrarinių ir miškų mokslų centro filialas Žemdirbystės institutas

LT
1 record

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