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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.

Barten

Protection expired

Phlox L. · Phlox

Bartels Breeding B.V

2 records

Balkapopur

Active

Phlox paniculata L. · Garden phlox

Kievit Christa

3 records

Baluptold

Active

Coreopsis L. · Tickseed

Darren Barshaw

2 records

Balsukaco

Active

Phlox paniculata L. · Garden phlox

Kim Grace H.

2 records

Balskywink

Active

Veronica spicata L. · Spiked speedwell

Emily E. Alff^^^Jessica D. Janes

2 records

Balsalskarv

Active

Salvia x sylvestris L. · Wood sage

Christa Kievit

2 records

Balkapopink

Active

Phlox paniculata L. · Garden phlox

Kievit Christa

2 records

Baillagtwo

Active

Lagerstroemia L. · Crape Myrtle

Roberts David Jonathan,McBee Oren,Schulze Justin

2 records

ADAROCONA

Active

Rosa L. · Rose

Michel Adam

2 records

Baby Blue

Active

Pulmonaria L. · Lungwort

TERRA NOVA NURSERIES INC

2 records

ABFG0413A

Application submitted

Ajuga reptans L. · Bugle

Plants for Europe Ltd

4 records

Apulia

Active

Vitis L. · Grapevine

Stefano Somma

2 records

Annys1

Active

Ilex crenata Thunb. · Japanese holly

van Nijnatten Andre Franciscus

2 records

Alisha KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

2 records

Admiral

Active

Humulus lupulus L. · Common hop

Peter Darby

3 records

Sofiia

Active

Fagopyrum esculentum Moench · Buckwheat

Lyubov Taranenko c/o Antaria GmbH / Oleg Yatsyshen c/o Antaria GmbH / Pavio Taranenko c/o Antaria GmbH / Oksana Drozd c/o Antaria GmbH

DE UA
3 records

WPB Pebbles

Active

Triticum aestivum L. · Bread wheat

Wiersum Plantbreeding B.V.

PL
3 records

Rusyn

Active

Hordeum vulgare L. · Barley

Hoiman Serhii Volodymyrovych, Sheremet Oleksandr Martynovych, Lehkun Ihor Borysovych, Linchevskyi Anatolii Adamovych,

UA
3 records

LG Litopys

Active

Triticum aestivum L. · Bread wheat

Mike Taylor

UA
3 records

Kruhozir

Active

Triticum aestivum L. · Bread wheat

Babiants Lazar Tyhranovych, Lyfenko Lina Semenivna, Fedchenko Volodymyr Pavlovych, Rodenko Halyna Anatoliivna, Shpykuliak IEvhenii Anatoliiovych, Narhan Tetiana Pavlivna, Nakonechnyi Mykola IUriiovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypovych

UA
3 records

Acuna

Active

Triticum aestivum L. · Bread wheat

APSOVSEMENTI SRL

ES
4 records

Zysk

Active

Triticum aestivum L. · Bread wheat

Lyfenko Lina Semenivna, Bosakovska Nataliia IUriivna, Nakonechnyi Mykola IUriiovych, Narhan Tetiana Pavlivna, Fedchenko Volodymyr Pavlovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypovych,

UA
3 records

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