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.

Fado

Active

Cucumis melo L. · Melon

SEMILLAS FITO, S.A.

4 records

Florida Elyana

Active

Fragaria L. · Strawberry

Craig Chandler

5 records

Fantastico

Active

x Triticosecale Wittm. ex A. Camus · Triticale

SAATZUCHT STRENG-ENGELEN GMBH&CO. KG

5 records

Folke

Terminated

Triticum aestivum L. · Bread wheat

Svensson, Gunnar/Fajersson, Fajer

4 records

Eyre

Active

Solanum lycopersicum L. · Tomato

RIJK ZWAAN ZAADTEELT EN ZAADHANDEL B.V.

5 records

Fluvia

Active

Cucumis melo L. · Melon

Hazera Genetics, Izrael

3 records

Firmus

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

3 records

Evadne

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Fisnics Lilav

Terminated

Impatiens New Guinea Group · New Guinea Impatiens

Syngenta Crop Protection AG

3 records

Everest

Active

Allium fistulosum L. · Welsh onion

FRANK FRANCIS

3 records

Eureka

Active

Cucumis sativus L. · Cucumber

PETOSEED CO

3 records

Escape

Terminated

Hordeum vulgare L. · Barley

Sejet Planteforaedling I,S

4 records

Elissavet

Active

Triticum aestivum L. · Bread wheat

HAO-DEMETER - Cereal Institute

4 records

Eslora

Active

Cucumis sativus L. · Cucumber

Miguel Angel Caballero

5 records

Enjoy

Active

Avena sativa L. · Oat

Landwirtschaftliche Fachschule Edelhof Saatzucht

5 records

Elbany

Terminated

Hordeum vulgare L. · Barley

Dr. Jörg Großer in Fa. KWS LOCHOW GMBH - Zuchtstation Wetze -

4 records

Ekvator

Active

Cucumis sativus L. · Cucumber

Nunhems B.V.

5 records

Epanis

Active

Triticum aestivum L. subsp. spelta (L.) Thell. · Spelt

CRAW-DPT SCIENCES DU VIVANT - UNITÉ D'AMÉLIORATION

5 records

Envero

Active

Cucumis melo L. · Melon

Nunhems B.V.

5 records

Falkland

Active

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

5 records

Eline

Application submitted

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Eldor

Active

Cucumis melo L. · Melon

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Elïxir

Active

Linum usitatissimum L. · Common flax

Terre de Lin Sca (FR)

4 records

EX 04847330

Active

Cucurbita pepo L. · Field pumpkin

Seminis Vegetable Seeds

5 records

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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

All terms →

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.