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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.

YAPRUBY

Active

Penstemon Schmidel. · Beard Tongue

Frederic C. Yates

2 records

WVO2F2

Active

Betula ermanii Cham. · Erman's birch

W.J. van Ooi VOF

2 records

Zephyr

Active

Pisum sativum L. · Pea

Limagrain UK

2 records

Tessa

Active

Delphinium elatum L. · Alpine delphinium

van Tol Benjamin R.

2 records

Verbrig

Active

Veronica prostrata L.

PETER BRIGGS

2 records

WPB Whistler

Protection expired

Triticum aestivum L. · Bread wheat

Wiersum Plantbreeding B.V.

2 records

WP18 MOW09

Active

Dianthus caryophyllus L. · Carnation

Whetman Plants International Limited

2 records

Wesarwhi

Active

Argyranthemum frutescens (L.) Sch. Bip. · Marguerite daisy

Westhoff Heinrich|Sudlohn, DE

2 records

TAN13522

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

TNCORSR

Active

Coreopsis verticillata L. · Whorled tickseed

HARINI KORLIPARA

2 records

URITW01

Active

Coreopsis L. · Tickseed

Kong Young Park

2 records

TAN04247

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

Titania

Active

Ribes L. · Currants

Tamas Pal

3 records

Trevi Fountain

Active

Pulmonaria L. · Lungwort

TERRA NOVA NURSERIES INC

2 records

Vivid VI

Active

Scabiosa L. · Pincushion flower

HARINI KORLIPARA

2 records

White Gold

Active

Spiraea L. · Spiraea

Liss Forest Nursery Ltd

2 records

Uhlsylt

Active

Rosa L. · Rose

UHL JÜRGEN

2 records

Tanrupeza

Terminated

Rosa L. · Rose

Rosen Tantau KG

2 records

TAN14301

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

TAN97103

Active

Rosa L. · Rose

Rosen Tantau KG

2 records

VEAZ0019

Terminated

Verbena L. · Vervain

Syngenta Crop Protection AG

2 records

TAN09415

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

TAN08973

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

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