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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.

KIYOMI

Active

Citrus reticulata Blanco · Mandarin orange

OKITSU FRUIT TREE RESEARC

ES
1 record

Kalasharskyi

Terminated

Juglans regia L. · Persian walnut

Tsurkan Ion

UA
1 record

JIDONG49

Terminated

Zea mays L. · Maize

Jilin Jidong Seeds Co. LTD

UA
1 record

Jubilejnaja Kopania

Withdrawn

Ribes nigrum L. · Blackcurrant

Institut Sadiwnictwa Ukrainska Akademija Agrarnich Nauk Volodymyr Kopan

PL
2 records

Kh 114 V

Terminated

Helianthus annuus L. · Sunflower

Brahin Oleksandr Mykolaiovych, Veselyi Vitalii Oleksandrovych, Kuzmysheva Nadiia Viktorivna, Syvenko Valentyna Ivanivna, Kolomatska Valeriia Pavlivna, Makliak Kateryna Mykolaivna, Kyrychenko Viktor Vasylovych,

UA
2 records

Key West

Active

Astilbe simplicifolia Makino · Star astilbe

Mts. Holtmaat

NL
1 record

Jive

Terminated

Fragaria L. · Strawberry

Egbertus Joseph Meulenbroek

UA
1 record

Kawegigamono desprez

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Kleinwanzlebener Saatzucht AG (DE)/Florimond Desprez SA (FR)

FR
1 record

Karesova ISK

Terminated

Prunus avium (L.) L. · Sweet cherry

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
1 record

Kansas - DK 38

Terminated

Sorghum bicolor (L.) Moench · Sorghum

Dekalb Genetics Corporation

IT
1 record

Karavaievs'kyi

Terminated

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

Nedvyha Oleh Mykolaiovych, Klymenko Svitlana Valentynivna,

UA
1 record

ITsB 0902

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

Barakhtians`kyi Mykola Pavlovych, Trokhymets` Ol`ha Ivanivna, Herasymenko Volodymyr Hryhorovych, Rybak Volodymyr Oleksiiovych, Lobodyn Oleh Kostiantynovych, Kulik Oleksandr Heorhiiovych, Roik Mykola Volodymyrovych,

UA
1 record

Imran

Terminated

Solanum lycopersicum L. · Tomato

Kees Konst

UA
2 records

Jolie

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

UA
1 record

Jessica

Terminated

Brassica napus L. · Rapeseed

SEMUNDO SAATZUCHT GMBH

IT
1 record

Jabłkowy GOF

Terminated

Apium graveolens L. var. rapaceum (Mill.) Gaud. · Celeriac

PlantiCo Hodowla i Nasiennictwo Ogrodnicze Golebiew sp. z o.o.

PL
1 record

Hora Rodzhers

Terminated

Diospyros kaki L. f. · Persimmon

Derev"ianko Vavsyl` Mykolaiovych, Bohdanovs`kyi IUrii IEvlampiiovych,

UA
2 records

IVIA TRI-705

Active

Citrus reticulata Blanco · Mandarin orange

IVIA

ES
1 record

Invicta ISK

Active

Ribes uva-crispa L. · Gooseberry

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
1 record

Heinz 3402 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

UA
2 records

Hinnonmäki Röd

Active

Ribes uva-crispa L. · Gooseberry

Information not available - Contact NL authorities

NL
1 record

/Herlakh/

Terminated

Hordeum vulgare L. · Barley

Kees Boot

UA
2 records

Heinz 2206 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

UA
2 records

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