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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.

Interzabunel

Terminated

Rosa L. · Rose

Interplant Roses B.V

2 records

KLEVP20062

Active

Verbena L. · Vervain

Ruijun Li

2 records

KN30 8

Active

Cornus x elwinortonii T. Molnar & Struwe

Elwin R. Orton^^^DAVID A. GANT

2 records

Harnext

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

3 records

KLECA19508

Active

Calibrachoa Cerv. · Calibrachoa

Dominik Losert

2 records

KLECA21566

Active

Calibrachoa Cerv. · Calibrachoa

Angelo Carrella

2 records

KLECA17002

Withdrawn

Calibrachoa Cerv. · Calibrachoa

Klemm+Sohn GmbH &Co.KG

2 records

Harfrisky

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Kerbespicit

Active

Begonia x tuberhybrida Voss · Tuberous begonia

Timothy Edward Kerley^^^David William Kerley^^^Priscilla Grace Kerley^^^Sarah Elisabeth Kerley

2 records

Grand Stone

Active

Scabiosa caucasica M. Bieb. · Pincushion Flower

van Steijn Peter|Voorhout, NL

2 records

Hacienda

Active

Pisum sativum L. · Pea

Seminis Vegetable Seeds

2 records

Gradictive

Active

Malus domestica (Suckow) Borkh. · Apple

Gradilis Recherche SARL

3 records

FRYCHARM

Active

Rosa L. · Rose

Gareth R. Fryer

2 records

Frybountiful

Protection expired

Rosa L. · Rose

Gareth R. Fryer

2 records

Harmaxim

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Jenkka

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Fresh Forward Holding B.V.

2 records

Kiastazuri

Active

Aster dumosus L. · Bushy aster

Andreas Niederländer

2 records

Jasper

Terminated

Verticordia plumosa x chamelaucium uncinatum

Digby Growns

2 records

Kercalsun

Active

Calendula officinalis x Calendula suffruticosa

David William Kerley, Timothy Edward Kerley, Sarah Elisabeth Kerley, Priscilla Grace Kerley

2 records

Jonica

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Walther Faedi^^^Gianluca Baruzzi^^^Pierluigi Lucchi^^^Paolo Sbrighi

4 records

Junior Fountain

Active

Phlox paniculata L. · Garden phlox

Vester Mart|Zwaanshoek, NL

2 records

High Contrast

Active

Pulmonaria L. · Lungwort

TERRA NOVA NURSERIES INC

2 records

Jade

Active

Phlox paniculata L. · Garden phlox

Verschoor Jan|Haarlem, NL

2 records

Heartbreaker

Active

Veronica L. · Speedwell

JOH. VAN NIEKERK

2 records

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