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.

Zetae

Active

Triticum durum Desf. · Durum wheat

VENTUROLI SEMENTI S.R.L.

4 records

WPB Enya

Active

Avena sativa L. · Oat

WIERSUM PLANTBREEDING

4 records

VB Duoniai

Active

Secale cereale L. · Rye

Lietuvos agrarinių ir miškų mokslų centras

4 records

Trofeum

Active

Hordeum vulgare L. · Barley

Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR

4 records

Trastevere

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Perotti Federico

3 records

Tiamat

Active

Triticum aestivum L. · Bread wheat

"Agro Bio Semena"OOD - Sofia (BG)

3 records

Triperf

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Florimond Desprez Veuve et Fils, FR

3 records

Tarchalska

Active

Pisum sativum L. · Pea

Danko Hodowla Roslin Sp.z.o.o.

4 records

Teorema

Active

Triticum aestivum L. · Bread wheat

CO.NA.SE SOC.COOP.AGR

4 records

Tanais

Active

Triticum aestivum L. · Bread wheat

Skrypka Ol`ha Viktorivna, Derov Anatolii Ivanovych, Vasiushkyna Nadiia IAkymivna, Shatylov Leonid Hryhorovych, Samofalov Oleksandr Petrovych, Hureieva Alla Volodymyrivna, Sapunova Liubov Vasylivna, Kalynenko Ivan Hryhorovych, Pryschepor Semen Nykyforovych

5 records

Suweren

Active

Hordeum vulgare L. · Barley

Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR

4 records

SU Hytoni

Active

Triticum aestivum L. · Bread wheat

ASUR Plant Breeding S.A.S

4 records

Stelvio

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Danko Hodowla Roslin Sp.z.o.o.

5 records

Sotalis

Active

Lactuca sativa L. · Lettuce

Bejo Zaden B.V.

4 records

Saule PR

Active

Hordeum vulgare L. · Barley

APP Agroresursu un ekonomikas institūts

4 records

Semba

Active

Triticum aestivum L. · Bread wheat

Lietuvos agrarinių ir miškų mokslų centras

4 records

Sirael

Terminated

Triticum aestivum L. · Bread wheat

SELGEN A.S

3 records

Sadovo 772

Terminated

Triticum aestivum L. · Bread wheat

I. Govedarov, A. Dimov, P. Stankova, K. Kolev, M. Mangova, D. Koleva

4 records

RGT Axell M

Active

Helianthus annuus L. · Sunflower

RAGT 2n, FR

3 records

Rezus

Active

Hordeum vulgare L. · Barley

Hodowla Roslin Smolice Sp.z o.o Grupa IHAR

4 records

RGT Black Pearl

Terminated

Avena sativa L. · Oat

RAGT 2N S.A.S

4 records

Reduta

Active

Triticum aestivum L. · Bread wheat

Danko Hodowla Roslin Sp.z.o.o.

5 records

PS Pankrac

Active

Avena sativa L. · Oat

Národné Polnohospodárske a Potravinárske Centrum (NPPC)

5 records

Rekrut

Active

Hordeum vulgare L. · Barley

Hodowla Roslin Smolice Sp.z o.o Grupa IHAR

4 records

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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

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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.