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.

Pasalimo F1

Active

Cucumis sativus L. · Cucumber

Vol`fhanh Otte

2 records

Orlyk F1

Terminated

Cucumis sativus L. · Cucumber

Shevkunov Valerii Mykolaiovych, Prutens`ka Nataliia Oleksiivna, Shamshyna Anna Viacheslavovna, Portiankin Alieksiei IEvhenovych, Havrysh Serhii Fedorovych,

1 record

Pam'iati Horlacha

Active

Triticum aestivum L. · Bread wheat

Chaika Anatolii Mykolaiovych, Dubova Oksana Anatoliivna, Burdeniuk-Tarasevych Larysa Antonivna,

2 records

Palanka

Terminated

Malus domestica (Suckow) Borkh. · Apple

Kuz`minets` Oksana Mykolaivna, Boldyzheva Liubov Dmytrivna,

2 records

ORASTRICAP

Active

Rosa L. · Rose

GAEC ORARD (FR)

1 record

Oranta

Terminated

Origanum vulgare L. · Oregano

Tkalych IUrii Vadymovych, Chaban Lesia Vasylivna, Pozniak Oleksandr Vasyl`ovych,

1 record

Oraniensteiner

Terminated

Vitis vinifera L. · Common grape vine

LAND HESSEN GEISENHEIM| Land Hessen, vertreten durch FA f. Wein- und Gartenbau, Ge- traenketechnologie u.Landespflege-Fachgb. f.Rebenzuech.u.-veredl.-

1 record

Ojebyn ISK

Terminated

Ribes nigrum L. · Blackcurrant

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

1 record

Olivette noire

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

Pam'iati Remesla

Terminated

Triticum aestivum L. · Bread wheat

Artemchuk Iryna Petrivna, Morhun Volodymyr Vasylovych, Bershads`ka Liudmyla Petrivna, Kavunets` Valerii Petrovych, Vlasenko Volodymyr Anatoliiovych, Koliuchyi Vasyl` Trokhymovych, Basanets` Hanna Stepanivna, Shelepov Volodymyr Vasyl`ovych, Kyrylenko Vira

2 records

Oleviia

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Holyk Liubov Mykolaivna, Kovalchuk Serhii Oleksandrovych, Levchenko Olha Serhiivna, Starychenko Vasyl Mykolaiovych,

4 records

PÃ©coui touar

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

P 22/J

Terminated

Malus Mill. · Apple

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

1 record

Olimpo F1

Withdrawn

Daucus carota L. · Carrot

Daniel Gabillard

2 records

Otaman

Terminated

Brassica napus var. napus · Rapeseed

Nikitchyn Dmytrii Ivanovych, Moroz Viktor Mykolaiovych, Komarova Iryna Borysivna,

1 record

Oksana

Terminated

Malus Mill. · Apple

Mezhenska Liudmyla Oleksiivna, Mezhenskyi Volodymyr Mykolaiovych,

2 records

Ornament

Terminated

Malus domestica (Suckow) Borkh. · Apple

Kopan` Kira Mykolaivna, Kopan Volodymyr Pavlovych,

2 records

Osella

Active

Vitis vinifera L. · Common grape vine

Dr. Norbert Becker im Staatl. Weinbauinstitut

1 record

Orlean

Active

Triticum aestivum L. · Bread wheat

Bulakh Oleksii Oleksandrovych, Kovalov Volodymyr Hryhorovych, Zaitsev Oleksii Borysovych,

2 records

Nizhnist`

Terminated

Monarda didyma L. · Bee balm

Semenchenko Ol`ha Mykhailivna, Rys` Myroslava V'iacheslavivna, Svydenko Liudmyla Viktorivna, Korablova Olha Anatoliivna,

1 record

Nourya

Application submitted

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

1 record

Nielluccio

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

NF311 ALBA

Application submitted

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Bernardini Danilo

2 records

Opal

Active

Humulus lupulus L. · Common hop

Herbert Ehrmaier

1 record

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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.