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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.

Kapaz

Active

Cucumis melo L. · Melon

Ralf Kuijpers

UA
2 records

Kandis

Application submitted

Cucurbita pepo L. · Field pumpkin

Levantia Seed Srl (IT)

BG
1 record

Italiiskyi Lebid

Active

Cucurbita pepo L. · Field pumpkin

Vovk Zhanna Mykolaivna

UA
2 records

Jack of All Trades

Withdrawn

Cucurbita pepo L. · Field pumpkin

Graines Voltz (FR)/Hollar Seeds (US)

FR
1 record

Kanzler

Active

Vitis vinifera L. · Common grape vine

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

DE
2 records

Kacper F1

Terminated

Cucumis sativus L. · Cucumber

Barbara Khrzhanovs`ka, Yezhy Matchak, Tereza Bartlomiieschak,

UA
2 records

IZABEL

Application submitted

Cucumis melo L. · Melon

INTERSEMILLAS SAU

ES
1 record

ITsB 0902

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

Barakhtians`kyi Mykola Pavlovych, Trokhymets` Ol`ha Ivanivna, Herasymenko Volodymyr Hryhorovych, Rybak Volodymyr Oleksiiovych, Lobodyn Oleh Kostiantynovych, Kulik Oleksandr Heorhiiovych, Roik Mykola Volodymyrovych,

UA
1 record

Idyliia

Active

Secale cereale L. · Rye

Symonenko Nina Viktorivna, Skoryk Olha Pavlivna, Skoryk Volodymyr Viktorovych, Skoryk Viktor Varfolomiiovych,

UA
2 records

Isa

Active

Vitis vinifera L. · Common grape vine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
2 records

Ice Celtic

Withdrawn

Lactuca sativa L. · Lettuce

Syngenta Crop Protection AG

NL
2 records

INX 1400

Active

Cucurbita pepo L. · Field pumpkin

Khaled Kazzaz

UA
1 record

Jivaro

Terminated

Cucumis melo L. · Melon

Clause Semences SA (FR)

FR
1 record

HUNTSMAN

Terminated

Triticum aestivum L. · Bread wheat

PLANT BREEDING INTERNATIONAL CAMBRIDGE

DK
2 records

JOKER

Terminated

Avena sativa L. · Oat

Serasem, FR

FR
1 record

Hrom

Application submitted

Triticum aestivum L. · Bread wheat

Fomenko Nina Panteleivna, Alfimov Volodymyr Oleksiiovych, Filobok Leontii Petrovych, Bukreieva Halyna Ivanivna, Kerymov Vahif Rakhmetovych, Kudriashov Ihor Mykolaiovych, Novikov Oleksii Volodymyrovych, Davoian Rumyk Ohanesovych, Puzyrna Ol`ha IUriivna, Be

UA
2 records

Jetodor F1

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

Siiak van der Ploh

UA
1 record

Jessica

Withdrawn

Pisum sativum L. · Pea

LOCHOW-PETKUS

AT
1 record

Hostynets

Terminated

Ribes uva-crispa L. · Gooseberry

Lushpihan Ol`ha Petrivna

UA
4 records

Jaugila

Terminated

Avena sativa L. · Oat

Lietuvos agrarinių ir miškų mokslų centro filialas Žemdirbystės institutas

LT
1 record

Hinnonmäki Grön

Active

Ribes uva-crispa L. · Gooseberry

Information not available - Contact NL authorities

NL
1 record

HONOLULU

Application submitted

Cucumis melo L. · Melon

SEMILLAS FITO, S.A.

ES
1 record

Irsay Oliver ISK

Terminated

Vitis L. · Grapevine

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

PL
1 record

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