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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.

Prenel

Terminated

Phaseolus vulgaris L. · Common bean

Vilmorin SA (FR)

FR
1 record

Prem"iera

Terminated

Monarda fistulosa L. · Bee balm

Khlypenko Liudmyla Anatoliivna, Svydenko Liudmyla Viktorivna, Rabotiahov Valerii Dmytrovych, Fedorchuk Mykhailo Ivanovych, Derev'ianko Vasyl` Mykolaiovych,

UA
2 records

Pudik

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Wos Henryk (Vos` Khenryk), Shcypak Vasyl Hennadiiovych, Bilokurets` Nataliia Petrivna, Nychyporuk Olena Oleksandrivna, Borivs`kyi Anatolii Frantsovych, Matviiets Volodymyr Hryhorovych, Shcypak Hennadii Vasylovych,

UA
2 records

Quimby

Application submitted

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
2 records

Poulsard

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Portugais bleu

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

POUSTINIA

Terminated

Rosa L. · Rose

ORIJE JOZEF RICHARD

BE
1 record

Prunelard

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Prista

Active

Vitis vinifera L. · Common grape vine

Zdravko Zankov, Ivan Todorov, Dimitar Mitev

BG
1 record

Prinzipal

Active

Vitis vinifera L. · Common grape vine

Prof. Dr. H. Becker

DE
2 records

Primitivo N

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Primera

Terminated

Vitis vinifera L. · Common grape vine

Prof. Dr. H. Becker

DE
2 records

Ploussard

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Plevenski kolorit

Terminated

Vitis vinifera L. · Common grape vine

Yordan K. Ivanov, Vasil Y. Valchev, Georgi S. Petkov

BG
1 record

Presto (Syn.: Alamo)

Protection expired

x Triticosecale Wittm. ex A. Camus · Triticale

Danko Hodowla Roslin Sp.z.o.o.

AT
1 record

Piroline

Protection expired

Hordeum vulgare L. · Barley

Florimond Desprez Veuve et Fils, FR

FR
1 record

Polians`ke

Terminated

x Triticosecale Wittm. ex A. Camus · Triticale

Bortnovskyi Vitalii Mykolaiovych, Petrychenko Vasyl Florovych, Lilyk Tetiana Volodymyrivna, Buhaiov Vasyl Dmytrovych,

UA
2 records

POLDJE RS

Terminated

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

ES
1 record

Pol`ovyk

Terminated

Triticum aestivum L. · Bread wheat

Lyfenko Lina Semenivna, Babaiants Lazar Tihranovych, Dorofiieva Zinaida Dmytriivna, Nakoniechnyi Mykola IUriiovych, Narhan Tetiana Pavlivna, Fedchenko Voorlodymyr Pavlovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypovych,

UA
2 records

Piquepoul noir

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Platine

Terminated

Lactuca sativa L. · Lettuce

Tezier SA (FR)

FR
2 records

Plantet

Active

Vitis L. · Grapevine

INCONNU (FR)

FR
1 record

Pinkgold

Withdrawn

Malus domestica (Suckow) Borkh. · Apple

Information not available - Contact NL authorities

NL
1 record

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