Diseases

Powdery mildew

Erysiphales

Powdery mildew is a fungal disease manifesting as a white web-like coating on plant organs, leading to tissue necrosis, fruit deformation, and significant crop losses.

Mentioned in descriptions 33 570 varieties reference book.

Powdery mildew is caused by ectoparasitic fungi of the order Erysiphales, which develop primarily on the surface of leaves, shoots, and fruits. The initial white web-like coating eventually densifies into "powdery" cushions, upon which fungal fruiting bodies may form as dark spots. As a result of the infection, tissues turn yellow and become necrotic, fruits may crack, and leaves drop prematurely.

The intensity of disease development depends on a complex of factors: high relative humidity, moderate temperatures, the presence of dense canopy, and excessive nitrogen nutrition. Risks increase with alternating dry and wet weather. The harmfulness of the disease is expressed in a reduction of the leaf assimilation area, deterioration of crop quality, and a decrease in the general winter hardiness of crops.

Assessment of variety resistance is conducted under field conditions at various stages of vegetation, most often during the full heading phase. To classify the degree of infection, scoring systems or intensity scales in percentages are used, where varieties with up to 10% infection are considered highly resistant (R), 11 to 40% as moderately resistant (M), and more than 41% as susceptible (S). Variety resistance is ensured by genetic mechanisms that prevent colonization by the pathogen or limit the development of its mycelium.

Sources10

Breakdown by crop

Powdery Mildew of Soft Wheat 1 157 Apple Powdery Mildew 1 127 Powdery mildew of cucumber 1 031 Powdery mildew of rose 785 Powdery Mildew of Barley 758 Powdery mildew of melon 670 Tomato powdery mildew 351 Powdery mildew of zucchini 333 Powdery mildew of strawberry 281 Powdery mildew of pea 268 Powdery mildew of triticale 241 Powdery mildew of lettuce 231 Powdery mildew — sugar beet 186 Powdery mildew of pepper 185 Gooseberry powdery mildew 176 Powdery mildew of oats 176 Apple powdery mildew 153 Powdery mildew — durum wheat 151 Powdery Mildew of Black Currant 143 Grape Powdery Mildew 110 Peach Powdery Mildew 81 Powdery mildew of rye 76 Powdery Mildew of Bigleaf Hydrangea 73 Verbena powdery mildew 69

Found in these crops

Bread wheat 1 186 Apple 1 130 Cucumber 1 080 Grapevine 980 Rose 785 Barley 762 Melon 681 Common grape vine 512 Tomato 361 Field pumpkin 335 Garden strawberry 280 Pea 279

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.

KAREN PS

Withdrawn

Cucumis sativus L. · Cucumber

Seminis Vegetable Seeds

1 record

Kodály Zoltán emléke

Active

Rosa L. · Rose

Mark Gergely / Mark Gergelyne

2 records

KM1210

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

2 records

Kiyoba

Withdrawn

Cucumis melo L. · Melon

Nunhems B.V.

2 records

Kirena

Active

Triticum aestivum L. · Bread wheat

Orliuk Anatolii Pavlovych, Lazer Petro Nartsysovych, Yokich Drahan Radomyrovych, Zhuzha Oleksandr Dmytrovych, Honcharova Kapitalina V'iacheslavivna, Bazalii Halyna Hryhorovna, Bazalii Valerii Vasyl`ovych,

2 records

Jubilejnaja Kopania

Withdrawn

Ribes nigrum L. · Blackcurrant

Institut Sadiwnictwa Ukrainska Akademija Agrarnich Nauk Volodymyr Kopan

2 records

Jaune canaria

Terminated

Cucumis melo L. · Melon

Service Officiel de Controle (FR)

1 record

Khazarka

Terminated

Triticum aestivum L. · Bread wheat

Derhachov Oleksandr Leonidovych, Kyrylenko Vira Viktorivna, Kolomiiets` Lidiia Andriivna, Shelepov Volodymyr Vasyl`ovych, Vlasenko Volodymyr Anatoliievych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych,

2 records

JOSEP CARRERAS

Terminated

Rosa L. · Rose

ORIOL AGUILA

1 record

JANDILLA

Application submitted

Capsicum annuum L. · Bell pepper

RAMIRO ARNEDO, S.A.

1 record

Jonkheer van Tets ISK

Active

Ribes rubrum L. · Redcurrant

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

1 record

Julian

Active

Cucurbita pepo L. · Field pumpkin

Israel Light, SAKATA SEED AMERICA INC., SAKATA VEGETABLES EUROPE S.A.S.,

1 record

Khmel`nychanka

Terminated

Triticum aestivum L. · Bread wheat

Dolezhal IAn, Artemchuk Iryna Petrivna, Morhun Volodymyr Vasylovych,

1 record

Key West

Active

Astilbe simplicifolia Makino · Star astilbe

Mts. Holtmaat

1 record

Jenkka

Active

Fragaria L. · Strawberry

Fresh Forward Holding

2 records

Kati

Terminated

Ribes uva-crispa L. · Gooseberry

Szkółka Drzew i Krzewów Artur Knapik

1 record

Kateryna

Terminated

Malus domestica (Suckow) Borkh. · Apple

Kopan` Kira Mykolaivna, Kopan Volodymyr Pavlovych,

1 record

Joannax XR

Application submitted

Solanum lycopersicum L. · Tomato

Axia NL B.V.

2 records

Jive

Terminated

Fragaria L. · Strawberry

Egbertus Joseph Meulenbroek

1 record

JEANNE D'ARC

Terminated

Rosa L. · Rose

STEEN JØRGENSEN

1 record

JB4

Active

Lycium chinense Mill. · Chinese boxthorn

Bio Tree OOD Sofia (BG)

2 records

JACDESA

Terminated

Rosa L. · Rose

BEAR CREEK GARDENS Inc. (US)

1 record

Kargu

Application submitted

Cucumis sativus L. · Cucumber

Manier Tohumculuk

1 record

KARNEVAL

Terminated

Rosa L. · Rose

STEEN JØRGENSEN

1 record

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Diseases

Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064
Grey mold 7 316

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.