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.

Marrubi

Active

Capsicum annuum L. · Bell pepper

Enza Zaden Beheer B.V.

3 records

Masko

Active

Solanum lycopersicum L. · Tomato

Jean-Christophe Lepeltier

2 records

Messager

Active

Pisum sativum L. · Pea

GSN Semences SAS (FR)

2 records

Melgic

Active

Cucumis melo L. · Melon

Sakata Vegetables Europe SARL (FR)

2 records

MANTECOSA_ALEXANDRE_LUCAS

Active

Pyrus communis L. · European pear

3 records

Mariia

Active

Triticum aestivum L. · Bread wheat

Usyk Liudmyla Oleksandrivna, Hrebeniuk Andrii Oleksandrovych, Honcharova Kapitalina V'iacheslavivna, Biliaieva Iryna Mykolaivna, Bazalii Halyna Hryhorivna, Orliuk Anatolii Pavlovych,

3 records

Mexicana

Active

Cucurbita pepo L. · Field pumpkin

Enza Zaden Beheer B.V.

2 records

Mexel

Active

Cucumis melo L. · Melon

Sakata Vegetables Europe SARL (FR)

3 records

Menphis

Active

Cucumis melo L. · Melon

HM.Clause S.A.S.

3 records

Metis

Active

Cucurbita pepo L. · Field pumpkin

Enza Zaden Beheer B.V.

4 records

Majestée

Active

Cucurbita pepo L. · Field pumpkin

Gautier Semences SAS (FR)

2 records

Melville

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Merydyan

Active

Helianthus annuus L. · Sunflower

Synysha Iotsych, Drahan Shkorych,

2 records

Mervita

Terminated

Cucumis sativus L. · Cucumber

HEVEKERL| A. Hevekerl in Fa. Carl Sperling & Co. (GmbH & Co. KG)

2 records

Melodia

Active

Cucurbita pepo L. · Field pumpkin

HM Clause SA (FR)

3 records

Magical Amethyst

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Kolster Beheer B.V.

2 records

Melidor

Active

Cucumis melo L. · Melon

De Ruiter Zonen (HR)

2 records

MAGDALENA

Application submitted

Rosa L. · Rose

MARROCCHIO (FR)

2 records

McNair 4823

Protection expired

Triticum aestivum L. · Bread wheat

Syngenta Participations AG

2 records

Menes

Active

Capsicum annuum L. · Bell pepper

RAMIRO ARNEDO, S.A.

2 records

Meipazdia

Terminated

Rosa L. · Rose

ALAIN ANTOINE MEILLAND (FR)

2 records

Maxwell

Active

Cucumis sativus L. · Cucumber

Syngenta Seeds B.V.

2 records

Maioral

Active

Cucumis melo L. · Melon

Enza Zaden Beheer B.V.

2 records

Meleas

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

2 records

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Diseases

Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064
Grey mold 7 316

All terms →

Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.