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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.

Florice

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Suiker Marcel

6 records

Drisstrawfortyfour

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Stewart Philip J. / Ferguson Michael D. / Robertson Renae / Coss Joanne F.

8 records

Cadenza

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Fresh Forward Holding B.V., 6851 ET Huissen

6 records

Auseasel

Active

Rosa L. · Rose

DAVID JC AUSTIN

7 records

AUSA6B15

Active

Rosa L. · Rose

David Austin Roses

7 records

Betulia Candy

Active

Begonia x hiemalis Fotsch · Elatior Begonia

LUBBERTUS H.KOPPE

6 records

Galaxy

Active

Avena sativa L. · Oat

NORDSAAT SAATZUCHT

DE EE LT LV
9 records

Rambo

Active

Avena sativa L. · Oat

Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR

AT CZ DK LT PL
8 records

LG Abrazo

Active

Triticum aestivum L. · Bread wheat

Pierrick Varenne

BG ES FR UA
8 records

WPB Calgary

Active

Triticum aestivum L. · Bread wheat

Wiersum Plantbreeding B.V.

AT NL PL
7 records

Rudy

Terminated

Avena sativa L. · Oat

NORDSAAT SAATZUCHT

DK EE LT LV SE
7 records

Simeto

Active

Triticum durum Desf. · Durum wheat

STAZIONE CONSORZIALE SPERIMENTALE DI GRANICOLTURA PER LA SICILIA

ES FR IT MT
7 records

Zentos

Active

Triticum aestivum L. · Bread wheat

Syngenta Hadmersleben

DK LT LV
8 records

Linus

Active

Triticum aestivum L. · Bread wheat

RAGT 2N S.A.S

LT PL UA
8 records

Prokop

Active

Avena sativa L. · Oat

Peter Hozlar

AT CZ SK UA
11 records

Neklan

Active

Avena sativa L. · Oat

SELGEN A.S

CZ DE PL SI
8 records

Alegoria

Active

Triticum aestivum L. · Bread wheat

Danko Hodowla Roslin Sp.z.o.o.

EE LT PL UA
10 records

Wilma

Active

Hordeum vulgare L. · Barley

Saatzucht Donau GmbH & Co.KG

AT LT UA
9 records

Sorbas

Active

Triticum aestivum L. · Bread wheat

Landwirtschaftliche Lehranstalten Triesdorf

EE LT
10 records

Pobeda

Active

Triticum aestivum L. · Bread wheat

Poljoprivredni fakultet (YU)

HU RO SI
12 records

Lombardo

Active

x Triticosecale Wittm. ex A. Camus · Triticale

LANTMÄNNEN SEED

DE LU PL
8 records

LG Nida

Active

Triticum aestivum L. · Bread wheat

LIMAGRAIN EUROPE

FI LT PL
9 records

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