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.

BUCBI

Terminated

Rosa L. · Rose

BUCK GRIFFITH (FR)

2 records

BTS SMART 9485

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed

2 records

BTS 3880

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed

2 records

BT64

Active

Triticum aestivum L. · Bread wheat

SEMILLAS BATLLE, S.A.

2 records

Calzodur

Active

Triticum durum Desf. · Durum wheat

Saatzucht Donau GmbH & Co.KG

3 records

Bluesset

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Caliph

Terminated

Cucurbita pepo L. · Field pumpkin

Harris Moran Seed Company (USA) (US)

2 records

Blue Boy

Active

Cucumis melo L. · Melon

UNITED GENETICS SEEDS CO

3 records

Calderon WB

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Masiá Ciscar S.L.

3 records

Carioca

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

Maribo Seed International ApS, DK

2 records

Boretta

Active

Pisum sativum L. · Pea

KLEIM| Harald Kleim

3 records

Boreal Beast

Active

Lonicera caerulea L. · Blue-berried honeysuckle

University of Saskatchewan

2 records

Blanc hâtif

Terminated

Cucumis sativus L. · Cucumber

Domaine Public (FR)

3 records

Camelia

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

SESVANDERHAVE NV-SA, BE

2 records

Breton

Active

Avena sativa L. · Oat

Danko Hodowla Roslin Sp.z.o.o.

3 records

Calmio

Terminated

Cucumis melo L. · Melon

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

2 records

Braeburn Arno

Active

Malus domestica (Suckow) Borkh. · Apple

Zbigniew Jezierski

4 records

Bittenfelder

Active

Malus pumila L. Mill. · Paradise apple

Station de Recherche York (US)

2 records

Bultaco

Application submitted

Capsicum annuum L. · Bell pepper

Monsanto Vegetable IP Management B.V.

2 records

Campuzano

Active

Cucumis melo L. · Melon

Enza Zaden Beheer B.V.

3 records

Bingo

Active

Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon

Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.

3 records

Caimital

Terminated

Cucumis melo L. · Melon

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

2 records

Blaník

Active

Malus domestica (Suckow) Borkh. · Apple

Ústav experimentální botaniky AV ČR, v.v.i. (CZ)

9 records

BTS SMART 4215

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed

2 records

1 2 ... 266 267 268 269 270 271 272 ... 505 506 Next

Jump to page 72 145 169 217 259 279 289 361 369 434

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.