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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.

Napa F1

Terminated

Daucus carota L. · Carrot

Ger Bimsdeboer

UA
1 record

Négrette

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

OCTAVIO

Active

Cucumis melo L. · Melon

MERIDIEM SEEDS S.L.

ES
1 record

NEMA-1200

Terminated

Solanum lycopersicum L. · Tomato

PETOSEED CO

ES
1 record

Mv Irma

Terminated

Triticum aestivum L. · Bread wheat

Balla Laszlo / Bedoe Zoltan / Lang Laszlo / Szunics Laszlo / Szunics Laszlone / Karsai Ildiko

HU
1 record

Mutabile

Withdrawn

Cucurbita pepo L. · Field pumpkin

ZSCHUNKE| Amadeus Zschunke c/o Friedemann Ebner

DE
1 record

Musala

Protection expired

x Triticosecale Wittm. ex A. Camus · Triticale

Svetlozar Dragushev

BG
2 records

Nanna

Active

Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage

Lim Chanju

UA
4 records

Noval

Withdrawn

Cucumis melo L. · Melon

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
1 record

Noaric

Terminated

Rosa L. · Rose

NOACK WERNER| Werner Noack

DE
1 record

Nika 11

Terminated

Trifolium pratense L. · Red clover

G. Naydenova, Tsv. Mihovski, D. Balabanova

BG
2 records

Mornen N

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Nibori

Active

Cucumis sativus L. · Cucumber

Shcevchenko Igor

UA
2 records

Mytets`

Active

Triticum aestivum L. · Bread wheat

Zhyvotkov Leonid Oleksandrovych, Turcheniuk Liudmyla Oleksiivna, Cheremkha Olena Maksymivna, Volohdina Halyna Borysivna, Zamlina Nina Petrivna, Lebedieva Halyna Danylivna, Chebakov Mykola Petrovych,

UA
2 records

Nevrokop 261

Terminated

Nicotiana tabacum L. · Tobacco

Kostadin B. Lulov

BG
1 record

Nival

Application submitted

Cucumis melo L. · Melon

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
2 records

Niukholl F1

Terminated

Daucus carota L. · Carrot

Ger Beemsterboer

UA
1 record

Nikoniia

Terminated

Triticum aestivum L. · Bread wheat

Piddubnyi Mykola Volodymyrovych, Bredyns`ka Nadiia Stepanivna, Babaiants Lazar Tihranovych, Kheifets Alla Markivna, Fedchenko Volodymyr Pavlovych, Yeriniak Mykola Ivanovych, Lyfenko Savelii Pylypovych, Boridchenko IUrii Oleksandrovych,

UA
1 record

Muskat tairovs'kyi

Terminated

Vitis vinifera L. · Common grape vine

Abliazova Aia Pavlivna, Tulaieva Maia Ivanivna, Dokuchaieva IEvheniia Mykolaivna, Aivazian Petros Karapetovych,

UA
1 record

MONTA

Application submitted

Malus domestica (Suckow) Borkh. · Apple

APP Darzkopibas instituts, R.Dumbravs

LV
1 record

Mv Pengoe

Terminated

Triticum aestivum L. · Bread wheat

Bedoe Zoltan / Lang Laszlo / Veisz Otto / Vida Gyula / Karsai Ildiko / Rakszegi Mariann / Meszaros Klara

HU
1 record

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