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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.

Propino

Active

Hordeum vulgare L. · Barley

Syngenta UK Ltd

DE EE FI FR LT LV
16 records

Rivolt

Active

x Triticosecale Wittm. ex A. Camus · Triticale

SECOBRA RECHERCHES S.A.S

AT CZ DE FR IT UA
13 records

Zlata

Active

Sinapis alba L. · White mustard

Hybritech, a.s.

AT CZ DE HR SI SK
13 records

NOS Gambit

Active

Hordeum vulgare L. · Barley

Nordic Seed A/S

DK EE FI NL PL UA
15 records

Lisuna

Application submitted

Lolium perenne L. · Perennial ryegrass

LUETKE| Dr. Ernst Luetke Entrup / MICHELMANN| Ing. agr. Guenter Michelmann

DE EE HR LV PL UA
13 records

Ludwig

Active

Triticum aestivum L. · Bread wheat

SAATZUCHT DONAU GES.M.B.H. & COKG

AT FR HR HU PL SI
15 records

Malz

Active

Hordeum vulgare L. · Barley

Svacina Petr

CZ HR HU NL SK UA
14 records

Lumaco

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Lantmannen SW Seed BV (NL)

AT DE EE FR LT LU
15 records

Lanetto

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Lantmännen SW Seed B. V.

CZ DE EE FI LT LU
13 records

Faxe

Active

Triticum aestivum L. · Bread wheat

Sejet Planteforaedling I,S

EE LT PL SE UA
13 records

LG Arnova

Active

Triticum aestivum L. · Bread wheat

Limagrain Europe, F

BG FR IT SK UA
16 records

Feedway

Active

Hordeum vulgare L. · Barley

Nordic Seed A/S

DK EE FI LT PL SE
14 records

Ben Connan

Active

Ribes nigrum L. · Blackcurrant

SCOTTISH CROP RESEARCH INSTITUTE

CZ DE DK NL PL SK
18 records

Ben Alder

Active

Ribes nigrum L. · Blackcurrant

SCRI / DAFS

DE DK LT NL PL SE
16 records

Baronie

Application submitted

Poa pratensis L. · Kentucky bluegrass

Theodorus P.M. op den Kamp

CZ DE FR NL PL SK
13 records

Teuto

Active

Hordeum vulgare L. · Barley

Secobra Saatzucht

DE DK LU PL UA
12 records

Viktorka

Active

Festuca rubra L. · Red fescue

Oseva Uni a.s., CZ

CZ DE FR PL SK
11 records

Ténor

Active

Triticum aestivum L. · Bread wheat

Unisigma GIE Recherche et Selection (FR)

FR HR IT PT UA
19 records

Tanatesil

Protection expired

Rosa L. · Rose

Tantau, Mathias|Uetersen, Federal Republic of Germany

DE DK FR NL SE
9 records

Provider

Active

Phaseolus vulgaris L. · Common bean

U S DEPT OF AGRICULTURE

CZ HR IT NL SI
9 records

Sydney

Active

Hordeum vulgare L. · Barley

SAATZUCHT STRENG-ENGELEN GMBH&CO. KG

DE EE LT LU PL
10 records

SU Midnight

Active

Hordeum vulgare L. · Barley

W.von Borries-Eckendorf, D

AT CZ DE PL UA
13 records

Meicoublan

Active

Rosa L. · Rose

Meilland, Marie-Louise|Antibes, France

DE DK FR IT SE
9 records

LG Aneri

Active

Triticum aestivum L. · Bread wheat

Limagrain Europe, FR

HU RO SK UA
13 records

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