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.

RGT MONT BLANC

Active

Avena sativa L. · Oat

RAGT 2N S.A.S

4 records

Planter's jumbo

Active

Cucumis melo L. · Melon

Grenell & Co.

4 records

Paul's Pink

Protection expired

Rosa L. · Rose

PAUL F. DEVOR

3 records

M 116

Active

Malus pumila L. Mill. · Paradise apple

EAST MALLING RESEARCH ST. (GB)

3 records

HM 1820

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Syngenta Crop Protection AG

3 records

Douce de l Avent

Active

Malus domestica (Suckow) Borkh. · Apple

Institut Français des Productions Cidricoles (I.F.P.C.), Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

5 records

DS-Admiral

Active

Pisum sativum L. · Pea

Danisco Seed

3 records

BIMBO STAR

Active

Cucumis sativus L. · Cucumber

KONONOV ALEKSANDR NIKOLAEVICh

3 records

AVON DEFIANCE

Terminated

Lactuca sativa L. · Lettuce

Plant Breeding International Cambridge Ltd (GB)

4 records

PS-10.1160

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Stephen M. Ackerman, Steven D. Nelson Michael D. Nelson

3 records

A14 09

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Masiá Ciscar S.L.

7 records

Piilag-V

Active

Lagerstroemia L. · Crape Myrtle

Kardos Joshua H.

4 records

AE'RONAVT

Active

Cucurbita pepo L. · Field pumpkin

OVOShhNAYa OPYTNAYa STANCzIYa TSXA im. V.I.E`DELShTEJNA DONECKAYA GOSUDARSTVENNAYA OBLASTNAYA SELSKOXOZYAJSTVENNAYA OPYTNAYA STANCZIYA

3 records

12-311

Active

Cucumis sativus L. · Cucumber

RIJK ZWAAN ZAADTEELT EN ZAADHANDEL B.V.

3 records

Korhulth 003

Active

Rosa L. · Rose

Wilhelm-Alexander Kordes, Tim-Hermann Kordes, John-Vincent Kordes

3 records

Zero 4

Active

Pisum sativum L. · Pea

Toft Plant Breeding APS

5 records

Violet D'Été

Active

Lagerstroemia indica L. · Crape myrtle

Lagerstroemia S.A.R.L.

3 records

USPHL O1

Terminated

Phlox L. · Phlox

Ushio Sakazaki

3 records

Scarlet O'Hara

Active

Papaver orientale L. · Oriental poppy

Oudshoorn Hubertus Gerardus

3 records

EC-BEGO-1901

Active

Begonia masoniana Irmsch. · Iron cross begonia

Smit Obed

3 records

PIILAG VII

Active

Lagerstroemia L. · Crape Myrtle

Michael A. Dirr^^^Rhonda Helvick^^^Mark Griffith^^^Oren McBee^^^Jeff Beasley

3 records

PIILAG-VIII

Active

Lagerstroemia L. · Crape Myrtle

Michael Dirr

4 records

Korsilu 07

Active

Rosa L. · Rose

Wilhelm-Alexander Kordes, Tim-Hermann Kordes, John-Vincent Kordes

3 records

Opening Act Pink a Dot

Active

Phlox L. · Phlox

Hansen Hans A

3 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.