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.

Jonagold

Active

Malus domestica (Suckow) Borkh. · Apple

Station de Geneva (US)

CZ ES FR HU NL PL +2

22 records

JB Maltasia

Application submitted

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GMBH and CO.KG

AT CZ DE FI FR HU +2

16 records

Arktis

Active

Triticum aestivum L. · Bread wheat

Schlieter Bernd, Busch Heinrich,

AT EE LT LV PL UA

16 records

Meineble

Active

Rosa L. · Rose

SNC Meilland et Cie

BE DE DK ES FR IT +1

12 records

Octopus

Active

Cucumis sativus L. · Cucumber

Syngenta Seeds, NL

CZ HR LT NL PL SI +1

12 records

Elstar

Active

Malus domestica (Suckow) Borkh. · Apple

T. Visser I.V.T.

BE DE FR HU NL PL +1

21 records

Laverda

Active

Hordeum vulgare L. · Barley

SAATEN UNION RECHERCHE

AT CZ DE FR HU PL +1

16 records

Korlingo

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

BE DE DK ES FR IT +1

12 records

Eiffel

Protection expired

Pisum sativum L. · Pea

Morten Helt-Poulsen c/o Maribo Seed

AT DE DK FR LT PL +1

18 records

Akratos

Active

Triticum aestivum L. · Bread wheat

Strube Research GmbH & Co. KG, D- 38387 Sollingen

EE FR HR LT SE UA

14 records

Carrera

Protection expired

Pisum sativum L. · Pea

Limagrain Europe S.A.

BE CZ DK FR NL PL +1

19 records

KWS Cantton

Active

Hordeum vulgare L. · Barley

SCHINKEL BURKHARD

DE DK FI IE PL UA

14 records

Kortemma

Active

Rosa L. · Rose

Wilhelm Kordes / Tim-Hermann Kordes / Margarita Kordes in Fa. W. Kordes' Söhne Rosenschulen GmbH & Co KG

BE DE FR HU NL PL

12 records

Tanselbon

Active

Rosa L. · Rose

Rosen-Tantau Mathias Tantau Nachfolger

DE FR IT NL PL

13 records

Camarosa

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

University of California

ES FR NL PL PT

25 records

Cripps Pink

Active

Malus domestica (Suckow) Borkh. · Apple

WESTERN AUSTRALIAN DEPARTMENT OF

DE ES FR NL

21 records

Diamante

Active

Fragaria L. · Strawberry

The Regents of the University of California

BG CZ HU SK

14 records

Camarosa

Active

Fragaria L. · Strawberry

Voth, Victor|Santa Ana, CA / Shaw, Douglas V.|Davis, CA / Bringhurst, Royce S.|Davis, CA

BG HU IT

13 records

Baigent

Active

Malus domestica (Suckow) Borkh. · Apple

PAUL BROOKFIELD_ / BARBARA BROOKFIELD_

FR NL

18 records

Brillyance

Active

Daucus carota L. · Carrot

Robert Oostveen

NL UA

19 records

Radrazz

Active

Rosa L. · Rose

William J. Radler (US)

12 records

Avalon

Active

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GmbH&Co.KG

CZ DE EE FI FR LT +2

20 records

Abarth

Active

Pisum sativum L. · Pea

Nickerson International Research SNC (FR)

CZ DE EE FR UA

16 records

Somerwood

Active

Pisum sativum L. · Pea

Syngenta Seeds B.V. (NL)

HR HU NL UA

13 records

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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.