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.

Hot Chocolate

Active

Dahlia Cav. · Dahlia

Dongen

1 record

Ivanna Poliska

Active

Triticum aestivum L. · Bread wheat

Kuzmenko Larysa Anatoliivna, Huba Iryna Ivanivna, Levchenko Olha Serhiivna, Shtakal Mykola Ivanovych, Kaminskyi Viktor Frantsevych, Holyk Liubov Mykolaivna,

2 records

INX 1405

Active

Cucurbita pepo L. · Field pumpkin

Khaled Kazzaz

1 record

Invicta ISK

Active

Ribes uva-crispa L. · Gooseberry

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

1 record

INTROPI

Terminated

Rosa L. · Rose

INTERPLANT BV (NL)

1 record

Hope

Active

Triticum aestivum L. · Bread wheat

Selgen, a.s. Vyzkumne centrum SELTON, s.r.o.

2 records

HM 0371

Application submitted

Solanum lycopersicum L. · Tomato

HM Clause Inc (US)

1 record

Honeoye MAR

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Szkółka Markiewicz Agnieszka Markiewicz-Januszewska

1 record

Hersbrucker Pure

Terminated

Humulus lupulus L. · Common hop

GMELCH| Franz Gmelch / EHRMAIER| Herbert Ehrmaier

1 record

Hinnonmäki Röd

Active

Ribes uva-crispa L. · Gooseberry

Information not available - Contact NL authorities

1 record

Heracles

Active

Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon

TROPICASEM (SN)

1 record

Herzog von Windsor

Protection expired

Rosa L. · Rose

TANTAU NACH| Rosen Tantau Mathias Tantau Nachfolger

1 record

HARGLOBE

Terminated

Rosa L. · Rose

HARKNESS ROSES and Co Ltd (GB)

1 record

Henichanka

Active

Triticum aestivum L. · Bread wheat

Lazer Petro Nartsysovych, Yokich Drahan Radomyrovych, Zhuzha Oleksandr Dmytrovych, Honcharova Kapitalina V'iacheslavivna, Babenko Dmytro Viktorovych,

2 records

Hecker

Terminated

Vitis vinifera L. · Common grape vine

ZIMMERMANN DR.| Dr. Johannes Zimmermann

2 records

HAWAI

Application submitted

Cucumis melo L. · Melon

RAMIRO ARNEDO, S.A.

1 record

Huxelrebe

Active

Vitis vinifera L. · Common grape vine

LAND RHEINLAND OPPENHEIM| Land Rheinland-Pfalz, vertreten durch DLR Rheinhessen-Nahe-Hunsrueck Dienstsitz Oppenheim

2 records

Hedi

Withdrawn

Hordeum vulgare L. · Barley

I.G. SAATZUCHT| I.G. Saatzucht GmbH & Co. KG

1 record

Hrenash chornyi

Terminated

Vitis vinifera L. · Common grape vine

Lykhovs`koi Volodymyr Volodymyrovych, Kotolovets` Zinaida Viktorivna, Poluliakh Alla Anatoliivna, Volynkin Volydymyr Oleksandrovych,

2 records

Hranatovyi Braslet

Application submitted

Rosa L. · Rose

Klymenko Zinaida Kostiantynivna

2 records

Harmonie

Active

Humulus lupulus L. · Common hop

Chmelařský institut s.r.o. (CZ)

2 records

Harant

Terminated

Malus domestica (Suckow) Borkh. · Apple

Kopan` Kira Mykolaivna, Kopan Volodymyr Pavlovych,

2 records

HANNE

Terminated

Rosa L. · Rose

PETER KAASTRUP

1 record

Grimpola

Application submitted

Capsicum annuum L. · Bell pepper

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

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

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.