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.

Rubypak

Active

Daucus carota L. · Carrot

ROGER FREEMAN

8 records

Ronvine

Active

Solanum lycopersicum L. · Tomato

Pascal Wanten

7 records

Ronsard

Active

Triticum aestivum L. · Bread wheat

SECOBRA RECHERCHES S.A.S

6 records

Raymond

Active

Cucumis melo L. · Melon

HAZERA SEEDS B.V., IL

5 records

Rapper

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan, NL

5 records

Regent

Active

Vitis L. · Grapevine

Gerhardt Alleweldt c/o Institut für Rebenzüchtung

6 records

Rafzuera

Active

Ribes uva-crispa L. · Gooseberry

Peter Hauenstein

7 records

Promise

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Stephen M. Ackerman, Steven D. Nelson Michael D. Nelson

7 records

Provine

Active

Solanum lycopersicum L. · Tomato

Silvertand, B. C. H. J.

7 records

Progression

Active

Solanum lycopersicum L. · Tomato

Nunhems B.V.

8 records

Poulhult

Application submitted

Rosa L. · Rose

Poulsen Roser A/S

5 records

Prize

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Steven D. Nelson^^^Michael D. Nelson^^^Stephen M. Ackerman

7 records

Polares

Active

Ribes nigrum L. · Blackcurrant

Research Institute of Horticulture (Instytut Ogrodnictwa) / Research Institute of Horticulture (Instytut Ogrodnictwa)

9 records

Pinot Iskra

Active

Vitis vinifera L. · Common grape vine

Morgante Michele

5 records

Peamight

Protection expired

Rosa L. · Rose

The Limes New Roses

5 records

Picolino

Active

Cucumis sativus L. · Cucumber

ENZA ZADEN

5 records

Pastor

Active

Trifolium pratense L. · Red clover

Beat Boller (CH)

8 records

p061103

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Vissers America B.V., NL

7 records

Osmia

Active

Trifolium pratense L. · Red clover

Feldsaaten Freudenberger GmbH & Co. KG., D-47800 Krefeld

6 records

Obigo

Active

Pisum sativum L. · Pea

Syngenta Crop Protection AG

11 records

Narita

Active

Daucus carota L. · Carrot

Bejo Zaden, NL

6 records

Nickel

Active

Vicia villosa Roth · Hairy vetch

Jouffray-Drillaud SA (FR)

9 records

Meikarouz

Active

Rosa L. · Rose

MEILLAND INTERNACIONAL

5 records

Meichibon

Active

Rosa L. · Rose

Meilland Alain A.

5 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

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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.