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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.

Venrosa

Terminated

Rosa L. · Rose

Wielkopolska Hodowla Roślin Ogrodniczych

PL
1 record

Vertina F1

Application submitted

Cucumis sativus L. · Cucumber

Paul Degreef

UA
2 records

VITA

Active

Rosa L. · Rose

Dzidra Rieksta

LV
1 record

Verity

Terminated

Fragaria L. · Strawberry

VINSON PETER

UA
2 records

Velika

Active

Vitis vinifera L. subsp. vinifera · Wine grape

Ivan D. Todorov

BG
2 records

Vezhen

Active

Hordeum vulgare L. · Barley

D. Valcheva, D. Valchev, S. Todorova, Ya. Pencheva

BG
1 record

TULLIO

Application submitted

Cucurbita pepo L. · Field pumpkin

MERIDIEM SEEDS S.L.

ES
1 record

Tukipink

Application submitted

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

NL
2 records

Trudivnytsia myronivs`ka

Application submitted

Triticum aestivum L. · Bread wheat

Siroshtan Andrii Anatoliiovych, Yurchenko Tetiana Vasylivna, Derhachov Oleksandr Leonidovych, Volohdina Halyna Borysivna, Zamlila Nina Petrivna, Humeniuk Oleksandr Volodymyrovych, Kyrylenko Vira Viktorivna, Kolomiiets` Lidiia Andriivna, Kochmars`kyi Valen

UA
2 records

Tromboncino

Terminated

Cucurbita moschata Duchesne · Butternut squash

Domaine Public (FR)

FR
1 record

Tulga

Application submitted

Cucumis sativus L. · Cucumber

Manier Tohumculuk

PL
1 record

Tsentylivka

Active

Triticum aestivum L. · Bread wheat

Tsentylo Leonid Vasyl`ovych, Boreiko Vasyl` Sydorovych,

UA
2 records

Tressot

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Trick

Application submitted

Cucurbita pepo L. · Field pumpkin

Levantia Seed Srl (IT)

BG
1 record

TRIBAT

Withdrawn

Triticum aestivum L. · Bread wheat

SEMILLAS BATLLE, S.A.

ES
1 record

UK 267

Terminated

Triticum aestivum L. · Bread wheat

Chebkaov Mykola Petrovych, Shelepov Volodymyr Vasyl`ovych, Zhyvotkov Leonid Oleksandrovych, Vlasenko Volodymyr Anattoliiovych, Ulich Oleksandr Leonidovych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych,

UA
1 record

Troi F1

Terminated

Cucumis sativus L. · Cucumber

Dementieva Alevtyna Volodymyrivna, Medviediev Anatolii Vasyl`ovych, Neporozhna IEvheniia Oleksandrivna,

UA
2 records

UG 205

Active

Cucurbita moschata Duchesne · Butternut squash

UNITED GENETICS SEEDS CO

PT
1 record

Tyurkoaz

Active

Hordeum vulgare L. · Barley

Dobroudja Agricultural Institute - General Toshevo (BG)

BG
1 record

Tourbat

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

TOBOSO

Application submitted

Capsicum annuum L. · Bell pepper

RAMIRO ARNEDO, S.A.

ES
1 record

Toska

Terminated

Cucumis sativus L. · Cucumber

Domaine Public (FR)

FR
1 record

Tymofii

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Plaska Valerii Mykolaiovych, Shcypak Vasyl Hennadiiovych, Popov Vitalii Mykolaiovych, Tsupko IUrii Vadymovych, Shypak Hennadii Vasyl`ovych,

UA
2 records

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