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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.

DORMELO

Terminated

Rosa L. · Rose

Pepinieres & Roseraies Dorieux GAEC (FR)

FR
1 record

Douce de l avant

Active

Malus domestica (Suckow) Borkh. · Apple

Institut Francais des Productions Cidricoles (FR)/Institut National de la Recherche Agronomique (FR)

FR
1 record

Ekler

Active

Cucurbita pepo L. · Field pumpkin

Seongiun Kim

UA
2 records

Donauveltliner

Active

Vitis vinifera L. · Common grape vine

HÖHERE BUNDESLEHRANSTALT UND BUNDESAMT FÜR WEIN UND OBSTBAU

AT
1 record

Diietychnyi

Terminated

Avena nuda L. · Naked oat

Skoryk Viktor Varfolomiiovych, Yehorova Tetiana Volodymyrivna, Vorozhko Svitlana Pavlivna, Parii Myroslav Fedorovych, Parii IUliia Oleksandrivna, Parii IAroslav Fedorovych, Kulyk IUliia Fedorivna, Riabovol Liudmyla Olehivna, Necheporenko Liudmyla Pavlivna

UA
2 records

Edera

Terminated

Malus domestica (Suckow) Borkh. · Apple

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

UA
1 record

DON SAHUQUILLO

Active

Cucumis melo L. · Melon

RAMIRO ARNEDO, S.A.

ES
1 record

Egla

Active

Fragaria L. · Strawberry

ARCUTI P. / FAEDI WALTER / ROSATI PASQUALE

IT
1 record

Donja MIX

Withdrawn

Cucumis sativus L. · Cucumber

ROYAL SLUIS

PL
2 records

Edison

Withdrawn

Zea mays L. subsp. mays (Sweet Corn Group) · Sweet corn

Graines Voltz (FR)

FR
1 record

Earliblue SGGW

Active

Vaccinium corymbosum L. · Highbush blueberry

Szkola Glowna Gospodarstwa Wiejskiego

PL
1 record

Dzhekon F1

Terminated

Cucumis sativus L. · Cucumber

Pozniak Oleksandr Vasyl`ovych, Pluzhnikova Liudmyla IEhorivna, Kryvets` Dmytrii Olehovych, Lisitsyn Volodymyr Mykolaiovych, Bakumenko Nadiia Vasylivna, Petrenko Mariia Petrivna,

UA
2 records

Dmiana

Active

Malus domestica (Suckow) Borkh. · Apple

Boldyzheva Liubov Dmytrivna

UA
2 records

DELSAMROS

Terminated

Rosa L. · Rose

Pepinieres et Roseraies Georges Delbard| FR

FR
1 record

Druzhba

Active

Vitis vinifera L. · Common grape vine

Yordan K. Ivanov, Vasil Y. Valchev, Georgi S. Petkov, Boris A. Muzyichenko (RU), Arif M. Aliev (RU), Ivan A. Kostrikin (RU)

BG
2 records

DELBLAN

Terminated

Rosa L. · Rose

Pepinieres et Roseraies Georges Delbard| FR

FR
1 record

Divico

Withdrawn

Vitis L. · Grapevine

Agroscope, CH

FR
1 record

Dee Star

Application submitted

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

NL
2 records

Dozhnytsia

Terminated

Malus domestica (Suckow) Borkh. · Apple

Kopan` Kira Mykolaivna, Kopan Volodymyr Pavlovych (pomer), Boldyzheva Liubov Dmytrivna,

UA
2 records

DELBLABE

Withdrawn

Rosa L. · Rose

Pepinieres et Roseraies Georges Delbard| FR

FR
1 record

DRAGON BALL

Application submitted

Cucumis melo L. · Melon

MERIDIEM SEEDS S.L.

ES
1 record

Didona

Terminated

Cucumis melo L. · Melon

Lymar Anatolii Ostapovych, Didenko Tetiana Volodymyrivna, Didenko Volodymyr Pavlovych,

UA
1 record

Dorsand

Terminated

Rosa L. · Rose

Francois Dorieux

DE
1 record

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