Diseases
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.
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.
Hordeum vulgare L. · Barley
Gesellschaft für goetheanistische Forschung e.V.
Hordeum vulgare L. · Barley
LIMAGRAIN EUROPE
Triticum aestivum L. · Bread wheat
Saatzucht Josef Breun GmbH & Co.KG (DE)
x Triticosecale Wittm. ex A. Camus · Triticale
Danko Hodowla Roslin Sp.z.o.o.
Triticum aestivum L. · Bread wheat
KOLESNIKOV FEDOR ALEKSEEVICh / PUChKOV YuRIJ MIHAJLOVICh / KERIMOV VAGIF RAHMETOVICh / ALFIMOV VLADIMIR ALEKSEEVICh / BESPALOVA LYuDMILA ANDREEVNA / KUDRYaShOV IGOR' NIKOLAEVICh / GORBAN' NINA TIMOFEEVNA / KONOTOP TAT'YaNA VITAL'EVNA / PUZYRNAYa OL'GA YuR
Triticum aestivum L. · Bread wheat
Florimond Desprez Veuve et Fils, FR
Cucumis sativus L. · Cucumber
Syngenta Seeds B.V.
Hordeum vulgare L. · Barley
Apsovsementi, I
Vitis L. · Grapevine
J. Csizmazia
x Triticosecale Wittm. ex A. Camus · Triticale
INAKTIV HegeSaat GmbH & Co. KG Herrn Dr. Elmar Weißmann
Daucus carota L. · Carrot
BEJO ZADEN
Prunus persica (L.) Batsch · Peach
Maillard Arsene / Maillard Laurence
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Solanum lycopersicum L. · Tomato
Nunhems B.V., Nunhems B.V.
Pisum sativum L. · Pea
Holland-Select Research B.V.
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Siboni Adriana, Raggi Giordano, Marchetti Enrico, Bernardini Danilo,
Triticum aestivum L. · Bread wheat
LIMAGRAIN EUROPE
Cucumis sativus L. · Cucumber
Nunhems B.V.
Cucumis melo L. · Melon
ASGROW SEED COMPANY
Malus domestica (Suckow) Borkh. · Apple
Prunus persica (L.) Batsch · Peach
Arsene Maillard Laurence Maillard
Prunus persica (L.) Batsch · Peach
Laurence Maillard, Arsene Maillard
Triticum aestivum L. · Bread wheat
Zoltán Bedő^^^László Láng^^^Ottó Veisz^^^Gyula Vida^^^Ildikó Karsai^^^Mariann Rákszegi^^^Klára Mészáros
Triticum aestivum L. · Bread wheat
Saatzucht Donau GmbH & Co.KG