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.

Potomak F1

Active

Cucumis sativus L. · Cucumber

Hari Besels

1 record

Portan

Active

Vitis vinifera L. · Common grape vine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

2 records

Plamenne

Terminated

Malus domestica (Suckow) Borkh. · Apple

Homeniuk Svitlana Viktorivna, Chupryniuk Viktor IAkovych, Nikonenko Mykhailo Mykolaiovych, Tsekhmistrenko Petro IUkhymovych, Ro Leonid Mykhailovych,

2 records

Plahasdor

Terminated

Rosa L. · Rose

HASCHKE| Erwin Haschke

1 record

Pilėnai

Terminated

Ribes nigrum L. · Blackcurrant

Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas

1 record

Pidzymok kharkivskyi

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Shcechenko Olha IEvheniivna, Melnyk Vira Serhiivna, Kapustina Tetiana Borysivna, Riabchun Viktor Kuzmych,

1 record

Poemat

Withdrawn

x Triticosecale Wittm. ex A. Camus · Triticale

Pflanzenzucht SaKa GmbH & Co.KG

1 record

Pinova ISK

Withdrawn

Malus domestica (Suckow) Borkh. · Apple

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

1 record

Pinore

Active

Vitis L. · Grapevine

Stanislav Vršič

1 record

Perlyna Stepu

Active

Triticum aestivum L. · Bread wheat

Vlaschuk Anatolii Mykolaiovycha, Bazalii Halyna Hryhorivna, Usyk Liudmyla Oleksandrivna, Vozhehova Raisa Anatoliivna,

2 records

Pesred

Protection expired

Salix L. · Willow

UNIVERSITATEA CRAIOVA - STATIUNEA DE CERCETARE-DEZVOLTARE PENTRU POMICULTURA VALCEA

2 records

PERLA DE FEREDEU

Terminated

Vitis vinifera L. · Common grape vine

DUMA MIHAIILLE IONATANOANA MARIADUMA TIBERIUDUMA MARINVANC FILIPLUCA MIRELAPOPI MORODAN CORNELIU

1 record

Perzikrode Zomerappel

Active

Malus domestica (Suckow) Borkh. · Apple

Information not available - Contact NL authorities

1 record

Peremozhets

Active

Hordeum vulgare L. · Barley

Zinkovs`ka Inna Oleksandrivna, Kraievs`kyi Anatolii Mykolaiovych, Karpenko Oleksandr Oleksandrovych,

4 records

PENCA DE MIRANDELA

Active

Brassica oleracea L. (Tronchuda Group) · Portuguese cabbage

Direcção Regional de Agricultura e Pescas do Norte (DRAPN)

2 records

Plevenska rosa

Active

Vitis vinifera L. · Common grape vine

Miroslav Ivanov, Zdravko Nakov, Vanyo Haygarov

2 records

Pepit

Application submitted

Cucurbita pepo L. · Field pumpkin

Levantia Seed Srl (IT)

1 record

Platus F1

Terminated

Solanum lycopersicum L. · Tomato

Maren Shutte, Ad Barten,

1 record

Plantus

Terminated

Cucumis sativus L. · Cucumber

Instytut Warzywnictwa im. Emila Chroboczka

2 records

Petit Béclan

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

Paulared ISK

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

1 record

Petrol

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Zaika IEvhenii Viktorovych, Holyk Liubov Mykolaivna, Buriak Vasyl` IUkhymovych, Kyryl`chuk Anzhela Mykolaivna, Starychenko Vasyl Mykolaiovych,

2 records

Patty Yellow

Application submitted

Cucurbita pepo L. · Field pumpkin

UNITED GENETICS ITALIA S.P.A

1 record

Piroso

Active

Vitis vinifera L. · Common grape vine

Dr. Norbert Becker im Staatl. Weinbauinstitut

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.