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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.

Sugrafiftyseven

Active

Vitis vinifera L. · Common grape vine

Terry A. Bacon,Terrence J. Frett

4 records

Spebrown

Active

Rosa L. · Rose

Jan Spek Rozen B.V.

5 records

SMNHML

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Wood Timothy D

4 records

SAKPXC028

Active

x Petchoa J. M. H. Shaw · Petchoa

TSUKAHARA JUN

4 records

SMPOTW

Active

Physocarpus opulifolius (L.) Maxim. · Ninebark

Wood Timothy D

4 records

Red Fortune

Active

Agastache mexicana (Humb., Bonpl. & Kunth) Linton & Epling · Mexican giant hyssop

Dick Degenhardt

4 records

Roman Beauty

Active

Rosmarinus officinalis L. · Rosemary

Fairweather Christopher|Beaulieu, Hants SO42 7YR, GB

4 records

SAKPXC024

Active

x Petchoa J. M. H. Shaw · Petchoa

TSUKAHARA JUN

5 records

SAKIMP022

Active

Impatiens New Guinea Group · New Guinea Impatiens

Sakata Seed Corporation / Sakata Seed Corporation

4 records

Radcor

Active

Rosa L. · Rose

William J. Radler

4 records

Ruby Frost

Active

Coreopsis L. · Tickseed

Korlipara Harini|Canby, OR, US

5 records

Poulcy014

Active

Rosa L. · Rose

Poulsen Roser A/S

5 records

SAKPXC022

Active

x Petchoa J. M. H. Shaw · Petchoa

TSUKAHARA JUN

5 records

Pink Supreme

Active

Monarda didyma L. · Bee balm

Oudshoorn Hubertus Gerardus

4 records

Profusion Orange

Protection expired

Zinnia L. · Zinnia

Sakata Seed Corporation (SCC)

4 records

Profusion Cherry

Protection expired

Zinnia L. · Zinnia

Sakata Seed Corporation (SCC)

4 records

Piotrek01

Active

Ajuga tenorei C. Presl · Bugle Bells

Szczesny Piotr

4 records

Poulcas024

Active

Rosa L. · Rose

Poulsen Roser A/S

4 records

Ramars

Active

Hydrangea L. · Hydrangea

RAMPP JUNGPFLANZEN GMBH & CO. VERTRIEBS KG

4 records

Profusion Fire

Active

Zinnia L. · Zinnia

Sakata Seed Corporation (SCC)

4 records

Passionate Blush

Active

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

Plant Growers Australia Pty Ltd

4 records

Popov

Terminated

Gerbera L. · Gerbera

Schreurs, P.

4 records

Poulpah053

Active

Rosa L. · Rose

Poulsen Roser A/S

5 records

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