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.

SV4107CV

Withdrawn

Cucumis sativus L. · Cucumber

HENK VAN KOOTEN

2 records

Taifun

Terminated

Triticum aestivum L. subsp. aestivum · Bread wheat

Lochow-Petkus GmbH Herrn Dr. Klaus Brunckhorst

2 records

Tangra

Active

Vitis vinifera L. · Common grape vine

Ivan Todorov, Galina Dyakova

2 records

Supporter 2

Terminated

Malus domestica (Suckow) Borkh. · Apple

FISCHER MANFRED| Prof. Dr. Manfred Fischer

1 record

Super Donia

Terminated

Cucurbita pepo L. · Field pumpkin

Julien Mazet

2 records

SUPERALFA DE CLUJ

Terminated

Humulus lupulus L. · Common hop

MUNTEAN LEON SORINCERNEA SOLOVASTRUSALONTAI ALEXANDRUMORAR GAVRILAVARBAN DANMUNTEAN LEONDUDA MARCELMUNTEAN SORINVARBAN RODICATOFANA MARIA

1 record

Suntapiro

Terminated

Glandularia x hybrida (hort. ex Groenl. & Rümpler) G. L. Nesom & Pruski · Common Garden Verbena

Suntory Flowers

1 record

Svitiaz

Terminated

Triticum aestivum L. · Bread wheat

Morhun Bohdan Volodymyrovych, Skrypl`ov Volodymyr Oleksandrovych, Morhun Volodymyr Vasyl`ovych,

2 records

TAVASCAN

Application submitted

Lactuca sativa L. · Lettuce

RAMIRO ARNEDO, S.A.

1 record

Sviatomykhailіvs'ka

Terminated

Ribes rubrum L. · Redcurrant

Boldyzheva Liubov Dmytrivna, Kopan Volodymyr Pavlovych, Kopan` Kira Mykolaivna,

1 record

Tadeo

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Danko Hodowla Roslin Sp z.o.o. (PL)

1 record

TABARD

Protection expired

Avena sativa L. · Oat

PLANT BREEDING INTERNATIONAL CAMBRIDGE

1 record

Sweet Pontoon

Application submitted

Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon

Bayer Holland B.V. (NL)

1 record

Szatmar F1

Terminated

Cucumis sativus L. · Cucumber

(Ulveczki Gabriella), (Dr.Szarka Janos), (Balogh Peter),

1 record

Supranax XR

Application submitted

Solanum lycopersicum L. · Tomato

Axia NL B.V.

2 records

SV8575YL

Active

Cucurbita pepo L. · Field pumpkin

Bill Johnson

2 records

Supporter 3

Terminated

Malus domestica (Suckow) Borkh. · Apple

FISCHER MANFRED| Prof. Dr. Manfred Fischer / PAETZOLD| Guenter Paetzold im Institut fuer Obstzuechtung Dresden-Pillnitz

1 record

Storgoziya

Active

Vitis vinifera L. · Common grape vine

Yordan K. Ivanov, Vasil Y. Valchev, Georgi S. Petkov

2 records

Svajai

Terminated

Ribes nigrum L. · Blackcurrant

Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas

1 record

Sulis

Application submitted

Capsicum annuum L. · Bell pepper

HM Clause SAS (FR)

1 record

Svaroh

Active

Ribes uva-crispa L. · Gooseberry

Lushpihan Ol`ha Petrivna

6 records

Sugrasixteen N

Active

Vitis vinifera L. · Common grape vine

Sun World International, Inc (US)

1 record

Supporter 1

Terminated

Malus domestica (Suckow) Borkh. · Apple

FISCHER MANFRED| Prof. Dr. Manfred Fischer

1 record

Suemeg

Terminated

Rosa L. · Rose

Mark Gergely

1 record

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Diseases

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Rust 14 859
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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.