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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.

Lindsey Ann

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

John David Bakale Jr.

3 records

Meigapencey

Active

Rosa L. · Rose

Alain Antoine Meilland

3 records

KLECA23A07

Application submitted

Calibrachoa Cerv. · Calibrachoa

Klemm+Sohn GmbH &Co.KG

3 records

KLECA07108

Active

Calibrachoa Cerv. · Calibrachoa

Nils Klemm

3 records

KORwedesi

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

3 records

Low Down

Active

Helianthus salicifolius A. Dietr. · Willow-leaf Sunflower

Keith R.W. Hammett

3 records

Little Henry

Active

Rudbeckia subtomentosa Pursh · sweet coneflower

Korlipara Harini

4 records

Kui Nuku

Active

Hibiscus coccineus x Hibiscus moscheutos L.

Zwetzig Gretchen

4 records

KORnolia

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

3 records

Jazzberry Jam

Active

Hibiscus L. · Hibiscus

Walters Gardens Inc

3 records

Itumfour

Active

Vitis L. · Grapevine

Juan Carreño Manuel Tornel

3 records

Korapfhecki

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

3 records

Lexyggip

Active

Rosa L. · Rose

LEVACY LTD

3 records

KLEVP14490

Active

Verbena L. · Vervain

Ruijun Li

3 records

Interfluco

Terminated

Rosa L. · Rose

Interplant Roses B.V

3 records

Kompeito

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Toyokazu Ichie

3 records

Katharina

Active

Vitis vinifera L. · Common grape vine

Jorg Wolf, D

3 records

KORROSOBI

Active

Rosa L. · Rose

Wilhelm-Alexander Kordes/ Tim-Herman Kordes/ John-Vincent Kordes

3 records

KORpot001

Active

Rosa L. · Rose

wilhelm kordes margarita kordes tim-hermann kordes

3 records

KORLINOLIP

Active

Rosa L. · Rose

Wilhelm-Alexander Kordes/ Tim-Herman Kordes/ John-Vincent Kordes

3 records

Korhemtra

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

3 records

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