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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.

FDN21WW0403

Withdrawn

Triticum aestivum L. · Bread wheat

Florimond Desprez

IT
1 record

FANTANGO

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

HORTICULTURE RESEARCH I.

ES
2 records

Florisia

Active

Vitis L. · Grapevine

Agroscope (CH)/Institut National de la Recherche Agronomique (FR)

FR
1 record

Fortuna

Active

Monarda fistulosa L. · Bee balm

Svydenko Liudmyla, Korablova Olha, Rys Myroslava

UA
4 records

EXCELETE

Withdrawn

Pisum sativum L. · Pea

SLUIS & GROOT BV (NL)

FR
1 record

Evita Blanche B

Active

Vitis L. · Grapevine

Georg WEISS (AT)/Gertrude MAYER (AT)

FR
1 record

Findling

Active

Vitis vinifera L. · Common grape vine

AKTIONSGEMEINSCHAFT| Aktionsgemeinschaft zur Erhaltung von Rebsorten e.V. im DLR Rheinhessen-Nahe-Hunsrueck

DE
2 records

Etiud

Active

Vitis vinifera L. · Common grape vine

Stasieva Mariia Ivanivna, Yarmak IEvheniia Dmytrivna, Storozhuk Kateryna Moisiivna, Bankovska Mariia Hryhorivna, Tulaieva Maiia Ivanivna, Meleshko Larysa Fedorivna, Dokuchaieva IEvheniia Mykolaivna,

UA
2 records

Feunate

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Festival PNE

Active

Petroselinum crispum (Mill.) Nym. ex A.W. Hill ssp. crispum · Parsley

Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.

PL
1 record

Felicia

Active

Vitis vinifera L. · Common grape vine

Dr. Rudolf Eibach / Prof. Dr. Reinhard Töpfer

DE
2 records

Fenomance

Active

Solanum lycopersicum L. · Tomato

Bayer Holland B.V.

NL
1 record

FDT10033

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Florimond Desprez

IT
1 record

Felixia

Application submitted

Rosa L. · Rose

ONORATO PIERANGELO

IT
1 record

Epas DS

Withdrawn

Hordeum vulgare L. · Barley

Lietuvos agrarinių ir miškų mokslų centro filialas Žemdirbystės institutas

LT
1 record

ERVIDEL

Application submitted

Cucumis melo L. · Melon

SEMILLAS FITO, S.A.

ES
2 records

Favorytka odeska

Active

Triticum aestivum L. · Bread wheat

Ihnatovskyi Oleksandr Oleksandrovych, Khodakova Tetiana Mykolaivna, Reshetnikova Valentyna Semenivna, Aleksieienko IEvhenii Viktorovych, Honcharuk Nina Oleksandrivna, Lytvynenko Raisa Ivanivna, Holub IEvheniia Anatoliivna, Lytvynenko Mykola Antonovych,

UA
2 records

Ernexia

Application submitted

Solanum lycopersicum L. · Tomato

Axia NL B.V.

NL
2 records

FD15WW065

Active

Triticum aestivum L. · Bread wheat

Florimond Desprez

IT
1 record

Elaris

Active

Vitis L. · Grapevine

Agroscope (CH)/Institut National de la Recherche Agronomique (FR)

FR
1 record

Erla Kolben

Active

Triticum aestivum L. subsp. aestivum · Bread wheat

Kärntner Saatbau e.Gen.

AT
1 record

EMIR

Protection expired

Hordeum vulgare L. · Barley

INNOSEEDS

DK
2 records

Fara

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

PL
2 records

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