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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.

Tolar

Active

Hordeum vulgare L. · Barley

PLANT SELECT, SPOL. S R.O.

BG CZ EE FI HR HU +6
24 records

Lamberto

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Z.Banaszak,M.Madra,K.Marciniak,T.Wolski,L.Brykczyńska,A.Szołkowski,B.Weiss,S.Wiśniewska, W.Brukwiński

BE CZ DE EE FR HR +6
33 records

Mulan

Active

Triticum aestivum L. · Bread wheat

Saaten-Union

BE EE HR HU LT PL +2
24 records

Henrike

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft mbH

AT CZ DE EE FR HR +5
22 records

Quench

Active

Hordeum vulgare L. · Barley

Syngenta UK Ltd

AT DE DK EE FI FR +5
26 records

Fandaga

Active

Hordeum vulgare L. · Barley

Saaten-Union

CZ EE FI FR HU LT +2
29 records

Boléro

Active

Daucus carota L. · Carrot

Vilmorin, F

BG CZ FR HR HU PL +2
20 records

Korbacol

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

DE ES FR HU IT NL +1
17 records

Meicobuis

Active

Rosa L. · Rose

MEILLAND ALAIN ANTOINE

BG HU NL PL
19 records

KWS Fantex

Active

Hordeum vulgare L. · Barley

SCHINKEL BURKHARD

CZ DE DK EE FI FR +4
26 records

Explorer

Active

Hordeum vulgare L. · Barley

VRDOLJAK GUSTAVO OMAR

CZ DE FR LT SK UA
28 records

Balin

Active

Poa pratensis L. · Kentucky bluegrass

DLF-TRIFOLIUM| DLF-Trifolium A/S

AT CZ DE DK EE HR +5
22 records

Grace

Active

Hordeum vulgare L. · Barley

Nordsaat Saatzuchtgesellschaft m.b.H. (DE)

CZ DE DK EE FI FR +3
31 records

Jof

Active

Pisum sativum L. · Pea

VELDHUYZEN V.ZANTE

BG CZ ES HR HU NL +3
21 records

Tankalcig

Active

Rosa L. · Rose

ROSEN TANTAU,MATHIAS TANTAU N.

DE HU NL PL UA
18 records

Sakini

Active

Lolium perenne L. · Perennial ryegrass

DLF-TRIFOLIUM A/S

CZ DE DK EE ES HR +6
21 records

Skagen

Active

Triticum aestivum L. · Bread wheat

W. von Borries-Eckendorf GmbH & Co.KG

EE FI LT LU LV PL +2
23 records

KWS Beckie

Active

Hordeum vulgare L. · Barley

SCHINKEL BURKHARD

CZ DE DK EE FR LT +4
21 records

Ellinor

Active

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GMBH and CO.KG

AT CZ DK EE FI FR +4
27 records

Kangoo

Active

Hordeum vulgare L. · Barley

Limagrain Nederland B.V.

AT CZ DE FR HR LT +3
21 records

Perun

Active

x Festulolium Aschers. et Graebn. · Festulolium

Slechtitelska stanice Hladke

CZ DE EE HR LT LU +2
24 records

Topaz

Active

Malus domestica (Suckow) Borkh. · Apple

Veleminsky, Jiri

CZ DE FR HU NL PL +2
29 records

Korenon

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

DE ES FI HU NL SE
15 records

Pekcougel

Active

Rosa L. · Rose

Pekmez, Paul|La Petite Pierre, 67290 Wingen-sur-Moder, France

DE ES FR IT NL
16 records

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