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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.

Goldie

Active

Hordeum vulgare L. · Barley

W WEIBULL

DK EE ES FR NL SE
19 records

Focus

Active

Hordeum vulgare L. · Barley

SECOBRA RECHERCHES S.A.S

CZ DE DK FI FR UA
22 records

Sonata

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Plant Research International, NL

FR HU NL PL UA
19 records

Sirkana

Active

Daucus carota L. · Carrot

Nunhems Zaden BV (NL)

FR HU NL PL UA
12 records

Adam

Active

Cucumis sativus L. · Cucumber

Bejo Zaden, NL

CZ HR HU NL PL SK
12 records

Darselect

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

SOCIETE CIVILE DARBONNE

ES FR HU NL PL
23 records

Luna

Active

Malus domestica (Suckow) Borkh. · Apple

Zima Jan, Louda Otto, Tupy Jaroslav,

CZ HU NL UA
18 records

Gaviota

Active

Fragaria L. · Strawberry

The Regents of the University of California

BG CZ HU SK
13 records

Milwa

Active

Malus domestica (Suckow) Borkh. · Apple

Station de recherche Agroscope Changins Wädenswil

FR NL UA
16 records

Sienna

Active

Pisum sativum L. · Pea

W BROTHERTON SEED CO INC

DE UA
17 records

New York 1

Active

Malus domestica (Suckow) Borkh. · Apple

Susan K. Brown, Kevin Maloney, Cornell University

FR
15 records

Ruiwitun

Active

Rosa L. · Rose

Pouw, A.A.|De Kwakel, Netherlands

NL
11 records

Inolov

Active

Malus domestica (Suckow) Borkh. · Apple

LAURENS FRANCOIS

FR
15 records

Fujion

Active

Malus domestica (Suckow) Borkh. · Apple

Michelangelo Leis, Alessio Martinelli, Francesco Tagliani, Gianfranco Castagnoli (deceased)

UA
15 records

Ausglade

Active

Rosa L. · Rose

HANS JURGEN EVERS (T)

11 records

Signora

Protection expired

Hordeum vulgare L. · Barley

SERASEM| SERASEM (G.I.E. commercial)

AT CZ DE ES FR HU +2
12 records

Jakubus

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft m.b.H. (DE)

CZ EE FR HU LT PL +1
18 records

Patras

Active

Triticum aestivum L. · Bread wheat

DEUTSCHE SAATVEREDELUNG AG

EE LT LU LV PL UA
16 records

Cornetto

Active

Triticum aestivum L. · Bread wheat

Secobra Saatzucht

AT EE FI LT LU LV +1
18 records

KWS Tonic

Active

Hordeum vulgare L. · Barley

KWS LOCHOW GMBH, DE

AT CZ DE DK FR LU +1
15 records

LG Absalon

Active

Triticum aestivum L. · Bread wheat

Limagrain Europe, FR

BG FR IT RO SK UA
18 records

Balaton

Active

Triticum aestivum L. · Bread wheat

Saatzucht Donau, A

AT BG HU PL SI SK +1
20 records

KWS Eterno

Active

Secale cereale L. · Rye

WILDE Peer, DE

AT DE DK EE PL UA
19 records

Tybalt

Active

Triticum aestivum L. · Bread wheat

Wiersum Plantbreeding B.V.

EE FR LT LU NL PL +1
20 records

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