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.

Neros

Active

Cucumis melo L. · Melon

Clause Tezier, FR

2 records

Nerita

Active

Cucurbita pepo L. · Field pumpkin

MERIDIEM SEEDS S.L.

2 records

Orangita

Active

Solanum lycopersicum L. · Tomato

Monsanto Vegetable IP Management B.V.

3 records

Nexio

Terminated

Cucumis melo L. · Melon

Clause (FR)

2 records

Okxo

Active

Cucurbita pepo L. · Field pumpkin

Sakata Seed Sudamerica Ltd (BR)

2 records

Oktan

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

4 records

Nevrokop 1146

Active

Nicotiana tabacum L. · Tobacco

Spas S. Gelemerov, Katerina G. Zefirova

3 records

Okhtyrchanka iuvileina

Active

Triticum aestivum L. · Bread wheat

Nedozim Andrii IUriiovych, Panov Oleksandr Ihorovych, Vlasenko Svitlana Volodymyrivna, Ivanov IUrii Mykolaiovych,

5 records

Oitol

Active

Cucumis sativus L. · Cucumber

SEMILLAS FITO, S.A.

2 records

Northstar

Terminated

Pisum sativum L. · Pea

Nunhems Seed Corporation

2 records

Odessa

Terminated

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Odeon

Terminated

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Neo

Application submitted

Hordeum vulgare L. · Barley

InterGrain Pty Ltd

2 records

Nataszka

Active

Cucumis sativus L. · Cucumber

Kees Broersen Zaden

2 records

Ocito

Active

Cucumis melo L. · Melon

Gautier Semences SAS (FR)

2 records

Neffiac

Terminated

Cucumis melo L. · Melon

Gautier Semences SAS (FR)

4 records

Numenor

Application submitted

Capsicum annuum L. · Bell pepper

Vilmorin-Mikado SAS (FR)

2 records

Nyobi

Active

Capsicum annuum L. · Bell pepper

Vilmorin-Mikado S.A.S.

3 records

Nagene 792

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

2 records

NuansaÏ

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Octopus

Active

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE NV-SA, BE

2 records

Novosadski 313

Active

Hordeum vulgare L. · Barley

NS ratarstvo (YU)

5 records

Nyva odes`ka

Terminated

Triticum aestivum L. · Bread wheat

Rybalka Oleksandr Illich, Babaiants Lazar Tihranovych, Reshetnikova Valentyna Semenivna, Kostiuk Stanislav Vasyl`ovych, Holub IEvheniia Anatoliivna, Rubakha Serhii Andriiovych, Lytvynenko Raisa Ivanivna, Honcharuk Nina Oleksandrivna, Lytvynenko Mykola Ant

3 records

NS 124/01

Active

Triticum aestivum L. · Bread wheat

Boryslav Kobyl`s`ky, Srbyslav Denchych,

3 records

1 2 ... 235 236 237 238 239 240 241 ... 505 506 Next

Jump to page 72 138 145 217 228 248 289 338 361 434

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.