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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.

Betesorang

Active

Begonia x tuberhybrida Voss · Tuberous begonia

ter Laak Wendela Antoinette

2 records

Casino

Active

Papaver orientale L. · Oriental poppy

Peek Eleonore|Oudelande, NL

3 records

Atomic Lilac

Active

Veronica L. · Speedwell

Verschoor Jan|Haarlem, NL

2 records

Ben Dorain

Active

Ribes nigrum L. · Blackcurrant

SCOTTISH CROP RESEARCH INSTITUTE

3 records

Catharina

Active

Echinacea purpurea (L.) Moench · Purple coneflower

van der Meer Cornelis|Rijpwetering, NL

2 records

Apricot Delight

Active

Achillea millefolium L. · Yarrow

Zwaan Michiel|Alphen aan den-Rijn, NL

2 records

Bubble Gum

Active

Pulmonaria L. · Lungwort

TERRA NOVA NURSERIES INC

2 records

Balsukalu

Active

Phlox paniculata L. · Garden phlox

Kim Grace H.

2 records

Cameo

Active

Magnolia L. · Magnolia

Vance Hooper

2 records

Bowl of Cherries

Active

Campanula punctata Lam. · Spotted bellflower

TERRA NOVA NURSERIES INC

2 records

Balkapowi

Active

Phlox paniculata L. · Garden phlox

Kievit Christa

2 records

Bokraruicri

Active

Rosa L. · Rose

Boot & Co. Boomkwekerijen B.V., De Ruiter Intellectual Property B.V.

2 records

BM8

Active

Baptisia tinctoria (L.) R. Br. · horseflyweed

Schaper & Brümmer GmbH & Co. KG

2 records

Blushing Shortwood

Active

Phlox paniculata L. · Garden phlox

Adam, Jr. Sinclair A.|Coatesville, PA 19320, US

2 records

Black Velvet

Active

Tiarella L. · Foamflower

TERRA NOVA NURSERIES INC

2 records

Atomic Violet

Active

Veronica L. · Speedwell

Verschoor Jan|Haarlem, NL

2 records

Artaban

Active

Vitis vinifera L. · Common grape vine

Bundesrepublik Deutschland vertreten durch Julius Kühn-Institut, Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

2 records

Benetti

Terminated

Chrysanthemum pacificum Nakai · Pacific chrysanthemum

Andreas Niederländer

2 records

BG66

Active

Baptisia tinctoria (L.) R. Br. · horseflyweed

Schaper & Brümmer GmbH & Co. KG

2 records

Ben Finlay

Active

Ribes nigrum L. · Blackcurrant

SCOTTISH CROP RESEARCH INSTITUTE

3 records

Arktis

Active

Vicia faba L. · Broad bean

Werner Horn

2 records

Big Ben

Active

Ribes nigrum L. · Blackcurrant

SCOTTISH CROP RESEARCH INSTITUTE

4 records

Balskywlue

Active

Veronica spicata L. · Spiked speedwell

Sloane M. Scheiber^^^Jessica D. Janes

2 records

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