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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.

CIVN260

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Leis Michelangelo, Martinelli Alessio

6 records

ESM R031

Active

Rosa L. · Rose

Hooijman Aloysius A. J.

4 records

Cleopatra

Active

Magnolia L. · Magnolia

Vance Hooper

4 records

Delgrarose

Active

Rosa L. · Rose

Société Nouvelle Pépinières et Roseraies Georges Delbard S.A.S.

4 records

Danfestar

Active

Gypsophila paniculata L. · Baby's-breath

Gavriel Danziger

4 records

Courier

Protection expired

Pisum sativum L. · Pea

New Zealand Institute for Crop and Food Research Ltd

5 records

Austwist

Active

Rosa L. · Rose

David J.C.Austin

5 records

AUStiger

Active

Rosa L. · Rose

David Austin Roses

5 records

Carasso

Active

Triticum aestivum L. · Bread wheat

Michael Winzeler

6 records

Cheweyesup

Active

Rosa L. · Rose

Christopher Warner

4 records

Beman Hellrosa

Protection expired

Begonia x hiemalis Fotsch · Elatior Begonia

WAGNER KONRAD

4 records

Bravo

Active

Humulus lupulus L. · Common hop

Roger D Jeske, Joe Brulotte

4 records

Balbalmose

Active

Monarda didyma L. · Bee balm

Trees Scott

5 records

BAIful

Active

Hydrangea arborescens L. · Smooth hydrangea

Zlesak David Charles,Soens Gail Katherine

4 records

Amsterdam

Active

Rosa L. · Rose

Steenks Beheer B.V.

5 records

Balchryurp

Active

Buddleja L. · Buddleia

Trees Scott C

4 records

Bonpri 635

Active

Euphorbia pulcherrima Willd. ex Klotzsch · Poinsettia

Berneutz, Andrew

4 records

Barbecue

Active

Rosmarinus officinalis L. · Rosemary

PUTIEVSKY E.^^^DUDAI N.^^^SAADI D.

4 records

Bartwentynine

Active

Phlox paniculata L. · Garden phlox

G.B.H BARTELS

4 records

Barsixtyone

Active

Phlox paniculata L. · Garden phlox

G.B.H BARTELS

5 records

Adabaring

Active

Rosa L. · Rose

Michel Adam

4 records

Balino

Active

x Triticosecale Wittm. ex A. Camus · Triticale

Dario Fossati

6 records

Balbalmink

Active

Monarda didyma L. · Bee balm

Trees Scott

5 records

Bailmacseven

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Roberts David Jonathan,McBee Oren,Schulze Justin

4 records

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