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.

Flämingsprofi

Protection expired

Avena sativa L. · Oat

Lochow Petkus GmbH (DE)

AT CZ DE EE HR HU +2

12 records

Triton

Active

Ribes nigrum L. · Blackcurrant

Tamas, Pal / Tamas, Beatrix

CZ DE DK HU NL SE +1

16 records

Elvira

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Wassenaar

DE ES FR HU NL PL +2

14 records

Piros

Active

Malus domestica (Suckow) Borkh. · Apple

Prof. Dr. Manfred Fischer / Heinz Murawski + im Institut für Obstforschung Dresden-Pillnitz / Dr. Johann Schmadlak / Prof. Dr. Christa Fischer

BE DE FR HU NL PL +1

17 records

Eurofit

Active

Triticum aestivum L. · Bread wheat

Saatzucht LFS Edelhof (AT)

AT BG HR HU SI SK +1

13 records

Artist

Active

Triticum aestivum L. · Bread wheat

SAATZUCHT FIRLBECK GMBH and CO KG

EE HU LT LV PL UA

12 records

SW Wikingett

Terminated

Hordeum vulgare L. · Barley

SW SEED GMBH| SW Seed GmbH

DE DK EE FI LT LV +1

16 records

Parker

Active

Cucumis sativus L. · Cucumber

Nunhems BV (NL)

BG CZ HR HU NL PL +1

9 records

Napa

Active

Daucus carota L. · Carrot

Bejo Zaden BV (NL)

CZ HR HU LT NL PL +1

9 records

Fidelius

Active

Triticum aestivum L. · Bread wheat

Saatzucht Donau GmbH & Co.KG

HU LT PL SI SK UA

13 records

Lg Arecibo

Active

Triticum aestivum L. · Bread wheat

Limagrain Europe SA (FR)

BG FR HR HU IT RO

13 records

Kapitol

Active

Triticum aestivum L. · Bread wheat

Secobra Saatzucht

DK EE LT NL PL

15 records

Husky

Active

Avena sativa L. · Oat

Nordsaat Saatzuchtgesellschaft m.b.H. (DE)

DE EE FI FR IE LT +1

11 records

Taninaso

Active

Rosa L. · Rose

Rosen-Tantau Mathias Tantau Nachfolger

AT DE DK IT NL PL

9 records

SY Signet

Active

Hordeum vulgare L. · Barley

Syngenta Crop Protection AG

CZ DE DK FI LT NL

14 records

Jaga

Active

Vicia sativa L. · Common vetch

Zrzeszenie przed. Hod. Ros. I Nasien, 0-930 Warszawa 71

FR HR IT PL SE SI

11 records

SU Laubella

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft mbH

AT CZ DE FR HU PL

15 records

Apart

Protection expired

Secale cereale L. · Rye

P.H. Petersen Saatzucht Lundsgaard GmbH (DE)

CZ DE DK EE FR LV +1

16 records

Sideral

Protection expired

Triticum aestivum L. · Bread wheat

ETS.C.C.BENOIST

BE DK ES FR PT SI

13 records

Siberia

Active

Hordeum vulgare L. · Barley

SEMUNDO| SW Seed GmbH

DE FR HU IT PL SI

14 records

Evita

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Vinson, Peter E.

DE ES FR NL PL PT +1

16 records

SU Promotor

Active

Secale cereale L. · Rye

Hybro Saatzucht GmbH&Co KG

CZ EE LT LV PL UA

14 records

SU Jule

Active

Hordeum vulgare L. · Barley

W. von Borries-Eckendorf OHG, Leopoldshöhe DE

AT CZ DE HU PL UA

11 records

Bolina

Protection expired

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft m.b.H. (DE)

CZ DE FR LV PL SE +1

11 records

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Diseases

Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064
Grey mold 7 316

All terms →

Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.