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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.

Dorohelior

Active

Rosa L. · Rose

Dümmen Group B.V.

1 record

DVERDEPINK

Terminated

Verbena L. · Vervain

Gavriel Danziger

1 record

DVER70

Terminated

Verbena L. · Vervain

Gavriel Danziger

1 record

Golden Jubilee

Terminated

Agastache rugosa (Fisch. & C. A. Mey) Kuntze · Chinese giant hyssop

MC DERMOTT FRANCIS

1 record

Glaurum

Application submitted

Vitis vinifera L. · Common grape vine

Daniele Migliaro^^^Marina Niero^^^Mauro Ostan^^^Riccardo Velasco

1 record

Doroviohil

Active

Rosa L. · Rose

Dümmen Group B.V.

1 record

Doroandin

Application submitted

Rosa L. · Rose

Dümmen Group B.V.

1 record

Dixie S

Terminated

Echinacea Moench. · Coneflower

HARINI KORLIPARA

1 record

Ditoros

Terminated

Phlox paniculata L. · Garden phlox

Ditoplant Export B.V.

1 record

GAULIN01

Withdrawn

Oenothera lindheimeri (Engelm. & A. Gray) W. L. Wagner & Hoch · Lindheimer's beeblossom

Frank Hammond

1 record

GR16PU

Active

Symphoricarpos x doorenbosii Krüssm. · Coralberry

Guido Rouwette

1 record

Garvivian

Terminated

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

1 record

Gala Rossa

Active

Malus domestica (Suckow) Borkh. · Apple

THOMPSON G.W.

3 records

Delsaumparf

Active

Rosa L. · Rose

Société Nouvelle Pépinières et Roseraies Georges Delbard S.A.S.

1 record

ERFZ0008

Active

Erysimum linifolium (Pers.) J. Gay · Wallflower

Syngenta Crop Protection AG

1 record

Frystereo

Terminated

Rosa L. · Rose

Gareth R. Fryer

1 record

Forever Blue

Terminated

Veronica longifolia L. · Garden speedwell

Lynne Knosher

1 record

Flock of Flamingos

Application submitted

Penstemon hartwegii Benth. · Hartweg's beardtongue

HARINI KORLIPARA

1 record

FLORVSBL1

Active

Veronica spicata L. · Spiked speedwell

Florensis B.V.

1 record

DANVER1786

Terminated

Verbena L. · Vervain

Gavriel Danziger

1 record

Fisnics Orga

Terminated

Impatiens New Guinea Group · New Guinea Impatiens

FISCHER GERMANY GMBH

1 record

Delice Hesperides

Application submitted

Salvia microphylla Kunth · Baby sage

Jan De Busschere

1 record

Delbreddab

Active

Rosa L. · Rose

Société Nouvelle Pépinières et Roseraies Georges Delbard S.A.S.

1 record

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