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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.

Malvern cross

Terminated

Ribes nigrum L. · Blackcurrant

SPINKS G.T. (GB)

FR
1 record

MAESTRANZA

Application submitted

Capsicum annuum L. · Bell pepper

SEMILLAS FITO, S.A.

ES
1 record

Mazurek Niwa

Application submitted

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Niwa Hodowla Roślin Jagodowych sp. z o.o.

PL
2 records

Mantico

Application submitted

Cucurbita pepo L. · Field pumpkin

Gautier Semences SAS (FR)

FR
1 record

MELONOWA ZOLTA

Active

Cucurbita maxima Duchesne · Giant pumpkin

WIESLAW LEGUTKO

UA
1 record

Mabamille

Protection expired

Matricaria recutita L. · German chamomile

Dr. Manfred Herold im Zentralinstitut für Sonder- kulturen und Zierpflanzen / Ernst Buschbeck in Fa. PHARMAPLANT GmbH / Dr. Hans Krüger im Zentralinstitut für Sonder- kulturen und Zierpflanzen / Martin Bauer GmbH & Co KG Herrn Dr. Hans-Jürgen Hannig

DE
1 record

Medea

Terminated

Malus domestica (Suckow) Borkh. · Apple

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

PL
2 records

Magyar Rizling

Terminated

Vitis L. · Grapevine

Bakonyi Karoly / Bakonyi Laszlo / Kocsis Laszlo

HU
1 record

MAGVAŠ

Terminated

Triticum aestivum L. · Bread wheat

Agricultural Research Institute (HU)

HR
1 record

Mae F1

Terminated

Cucumis melo L. · Melon

Angeles Maria

UA
1 record

Luminan

Active

Vitis L. · Grapevine

Institut National de la Recherche Agronomique (FR)/Bureau National Interprofessionnel du Cognac (FR)

FR
1 record

Mauzac rose

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Magnat

Active

Humulus lupulus L. · Common hop

Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy

PL
1 record

Marylka

Active

Berberis thunbergii DC. · Japanese barberry

Dariusz Kapias

PL
1 record

MARMERAL

Application submitted

Cucumis melo L. · Melon

INTERSEMILLAS, S.A.

ES
1 record

Lorraine

Application submitted

Lactuca sativa L. · Lettuce

ReinSaat KG

AT
1 record

Lord F1

Terminated

Cucumis sativus L. · Cucumber

Krylov Oleh Mykolaiovych, Borysov Oleksandr Volodymyrovych,

UA
1 record

Lybid

Active

Malus domestica (Suckow) Borkh. · Apple

Doslidna stantsiia pomolohii im. L.P. Symyrenka Instytutu sadivnytstva Natsionalnoi akademii ahrarny

UA
2 records

Lundan

Application submitted

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
2 records

Martonvasari 25

Terminated

Triticum aestivum L. · Bread wheat

Balla Laszlo / Bedoe Zoltan / Lang Laszlo / Szunics Laszlo / Szunics Laszlone

HU
1 record

Lired ISK

Terminated

Malus domestica (Suckow) Borkh. · Apple

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

PL
1 record

Lorna

Terminated

Hordeum vulgare L. · Barley

CIV (NL)

FR
1 record

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