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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.

Tequila Sunrise

Active

Phlox paniculata L. · Garden phlox

Verschoor Jan|Haarlem 2015 CS, NL

3 records

White King

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Toyokazu Ichie

3 records

TNTIA041

Active

Tiarella L. · Foamflower

Gossett Gary J.|Portland, OR, US

3 records

TAN05372

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

TAN00798

Active

Rosa L. · Rose

Hans-Juergen Evers

3 records

Villars

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Agroscope

4 records

Tuscan Sun

Active

Heliopsis helianthoides (L.) Sweet · Oxeye sunflower

Hanson Brent|Rhinelander, WI 54501, US / Zlesak David Charles|St. Paul, MN 55105, US

3 records

Trialdo

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Arnold Schori Agroscope

4 records

TAN04999

Active

Rosa L. · Rose

Evers Christian|Uetersen, DE

3 records

TAN08104

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Tan07891

Active

Rosa L. · Rose

EVERS CHRISTIAN

4 records

Tan06225

Active

Rosa L. · Rose

EVERS CHRISTIAN

4 records

Suplumtwentysix

Active

Prunus salicina Lindl. · Japanese plum

Mowrey Bruce D.|Watsonville, CA / Cain David W.|Bakersfield, CA / Fear Carlos D.|Aptos, CA

4 records

TAN02100

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Sunvivapa

Application submitted

Verbena L. · Vervain

WATANABE, YUKI / TACHIBANA, RYUICHI / WATANABE, YUKI / TACHIBANA, RYUICHI

3 records

Spring Symphony

Active

Tiarella L. · Foamflower

TERRA NOVA NURSERIES INC

3 records

Sunjiraore

Active

Begonia x tuberhybrida Voss · Tuberous begonia

Yamaguchi Hideki

4 records

Sumthun 02

Active

Thunbergia alata Bojer ex Sims · Black-eyed Susan vine

Schrader Ralf|59348 Ludinghausen, DE

3 records

TAN08387

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Sunmarirosta

Terminated

Verbena L. · Vervain

Tomoya Misato, Kiyoshi Miyazaki

3 records

Sunjiraho

Active

Begonia x tuberhybrida Voss · Tuberous begonia

Yamaguchi Hideki

3 records

TAN97274

Active

Rosa L. · Rose

Hans-Juergen Evers

3 records

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