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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.

Lucky

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

Seminis Vegetable Seeds

CZ ES HR NL PL SK
9 records

Lavina

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

DE GR HR HU IT UA
8 records

Lemmy

Active

Triticum aestivum L. · Bread wheat

Nordsaat Saatzucht GmbH, Böhnhausen DE

EE HU LT PL UA
13 records

KWS Chilis

Active

Hordeum vulgare L. · Barley

KWS Lochow

AT CZ DE DK EE UA
10 records

Granny

Active

Triticum aestivum L. · Bread wheat

SELGEN A.S

EE LT SK UA
11 records

Grit

Protection expired

Hordeum vulgare L. · Barley

VEB SAAT- UND PFLANZENGUT

DE DK IE IT NL SE
14 records

Inpetto

Active

x Triticosecale Wittm. ex A. Camus · Triticale

SW Seed B. V.

CZ DE EE LT LV SE
13 records

Flämingsstern

Protection expired

Avena sativa L. · Oat

Lochow Petkus GmbH (DE)

AT DE HR HU PL SK
11 records

Fidelio

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Wolski, T

DE EE FI LT PL SE
14 records

Colonia

Active

Triticum aestivum L. · Bread wheat

NICKERSON INTERNATIONAL RESEARCH SNC

BE HU LT LU PL
12 records

Herold

Protection expired

Pisum sativum L. · Pea

Selgen a.s., CZ

AT CZ DE DK HR SK
10 records

Caledon

Active

Avena sativa L. · Oat

Nordsaat Saatzucht GmbH, Böhnhausen DE

CZ DE EE HU LT PL
10 records

Jacky

Active

Avena sativa L. · Oat

Nordsaat Saatzucht GmbH,DE

DE EE FI FR LT SE
10 records

Viskosa

Terminated

Hordeum vulgare L. · Barley

RICHTER| Edelgard Richter in Fa. NORDSAAT Saatzucht- gesellschaft mbH

AT DE EE FI FR
14 records

Akvitan

Active

Triticum aestivum L. · Bread wheat

Landwirtschaftliche Lehranstalten Triesdorf

EE LT PL UA
14 records

Diana

Active

Cucumis sativus L. · Cucumber

PETOSEED CO

CZ DK ES HU NL SK
8 records

Viroflay

Active

Spinacia oleracea L. · Spinach

OHLSENS ENKE (DK)

HR HU IT SI SK
8 records

Unique

Active

Poa pratensis L. · Kentucky bluegrass

PURE SEED TESTING

DE FI FR NL SE
14 records

SW Valentino

Protection expired

x Triticosecale Wittm. ex A. Camus · Triticale

Rune Elovson

DK EE LT LV SE
16 records

Stromboli

Active

Triticum aestivum L. · Bread wheat

SARL ADRIEN MOMONT ET FILS, FR

FR HR IT SK UA
13 records

Regina

Active

Cucumis sativus L. · Cucumber

SEMO a.s

BG CZ FR NL SK
8 records

ST Rotterdam

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Strube GmbH Co.KG, Söllingen DE

BE CZ DE HU NL
8 records

Poulwee

Application submitted

Rosa L. · Rose

Poulsen Roser Aps (DK)

DE DK FR IT NL
8 records

Reggae

Protection expired

Hordeum vulgare L. · Barley

van Beuningen, Leon

BE DK FR NL SE
15 records

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