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.

Orblanche

Terminated

Avena sativa L. · Oat

Ets Claude Camille Benoist SA (FR)

3 records

Orbita

Active

Spinacia oleracea L. · Spinach

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

2 records

Oktava odes`ka

Active

Triticum aestivum L. · Bread wheat

Babaiants Ol`ha Vadymivna, Syvolap IUrii Mykhailovych, Reshetnikova Valentyna Semenivna, Solomonov Ruslan Viacheslavovych, Lytvynenko Raisa Ivanivna, Rubakha Serhii Andriiovych, Holub IEvheniia Anatoliivna, Honcharuk Nina Oleksandrivna, Topal Mykola Mykol

3 records

Nuit australe

Active

Solanum lycopersicum L. · Tomato

Domaine Public (FR)

2 records

Odin

Terminated

Pisum sativum L. · Pea

PRODANA SEED A/S - DLF SEEDS A/S

3 records

Pallini

Active

Avena sativa L. · Oat

HAO-DEMETER - Cereal Institute

2 records

Oliwka Żółta

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

3 records

Olivaro

Application submitted

Pisum sativum L. · Pea

Van Waveren Saaten GmbH

3 records

Otocar

Terminated

Lactuca sativa L. · Lettuce

Vilmorin-Mikado S.A.S.

3 records

Nun 09440

Application submitted

Solanum lycopersicum L. · Tomato

Nunhems Netherlands B.V.

3 records

Otlichnik

Active

Prunus persica (L.) Batsch · Peach

PERFIL'EVA ZOYa NIKOLAEVNA / SMYKOV ANATOLIJ VLADIMIROVICh / SMYKOV VLADIMIR KARPOVICh / FEDOROVA OL'GA STEPANOVNA

4 records

Nocibe

Active

Cucumis melo L. · Melon

Enza Zaden Beheer B.V.

2 records

Noah

Active

Cucurbita pepo L. · Field pumpkin

Sakata Seed Sudamerica Ltd (BR)

2 records

Or Primizia

Active

Cucumis sativus L. · Cucumber

ORTORICERCA SRL

2 records

Oberkärntner

Active

Secale cereale L. · Rye

Kärntner Saatbau reg.Gen.m.b.H.

3 records

Nyostar

Active

Capsicum annuum L. · Bell pepper

Vilmorin-Mikado SAS (FR)

3 records

Ottawa

Terminated

Trifolium pratense L. · Red clover

Agriculture Canada (CA)

2 records

Nikomate

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

3 records

Noriac

Active

Cucurbita pepo L. · Field pumpkin

Gautier Semences SAS (FR)

2 records

Optimum

Protection expired

Cucumis sativus L. · Cucumber

Hybrids Ellas Abee

2 records

Opoka

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE N.V./S.A.

2 records

Orzu

Active

Cucumis sativus L. · Cucumber

Nunhems B.V.

2 records

Novelia

Protection expired

Pisum sativum L. · Pea

NEBELUNG GMBH| Bruno Nebelung GmbH

3 records

Nesmet

Active

Capsicum annuum L. · Bell pepper

HM.Clause S.A.S.

2 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

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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.