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
W WEIBULL
Hordeum vulgare L. · Barley
KWS UK LTD
Triticum aestivum L. · Bread wheat
Societa Produttori Sementi S.p.A
x Triticosecale Wittm. ex A. Camus · Triticale
Saatzucht Donau GmbH & Co.KG
Triticum aestivum L. · Bread wheat
FORSCHUNGSANSTALT FÜR AGRARÖKOLOGIE UND LANDBAU^^^Station Fédérale de Recherches Agronomiques de Changins (RAC)
Triticum aestivum L. · Bread wheat
Lonnet Philippe
Triticum aestivum L. · Bread wheat
SELGEN A.S
Triticum aestivum L. · Bread wheat
CO.NA.SE soc Coop.Agr. (IT)/Apsov sementi S.p.A. (IT)
Triticum aestivum L. · Bread wheat
Mikic Sanja, Jevtic Radivoje, Momcilovic Vojislava, Mirosavljevic Milan,
x Triticosecale Wittm. ex A. Camus · Triticale
Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy
Hordeum vulgare L. · Barley
Selgen a.s., CZ
Triticum aestivum L. · Bread wheat
SELGEN A.S
Triticum aestivum L. · Bread wheat
Societa Produttori Sementi S.p.A
Hordeum vulgare L. · Barley
SECOBRA RECHERCHES S.A.S
Pisum sativum L. · Pea
RAGT 2N S.A.S
Hordeum vulgare L. · Barley
Saatzucht Donau GmbH & Co.KG
Triticum durum Desf. · Durum wheat
LIMAGRAIN EUROPE S.A.
Pisum sativum L. · Pea
KWS LOCHOW GMBH, Germany
Linum usitatissimum L. · Common flax
University of Saskatchewan Crop Development Centre
Triticum aestivum L. · Bread wheat
Secobra Saatzucht
Triticum aestivum L. · Bread wheat
Syngenta Seeds SAS, FR
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE, N.V./S.A.
Brassica napus L. · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
Triticum aestivum L. · Bread wheat
Nina Pfeiffer