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.
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Crop Protection AG, CH
Beta vulgaris Sugar Beet Group · Sugar beet
Dietrich Hauer, Wolfgang Mechelke,
Beta vulgaris Sugar Beet Group · Sugar beet
LION SEEDS
Hordeum vulgare L. · Barley
Syngenta Crop Protection AG, CH
x Triticosecale Wittm. ex A. Camus · Triticale
Stephanie Franck^^^Peter Franck^^^Norbert Starck
Hordeum vulgare L. · Barley
SELGEN A.S
x Triticosecale Wittm. ex A. Camus · Triticale
SAATZUCHT STRENG-ENGELEN GMBH&CO. KG
Triticum aestivum L. · Bread wheat
Pierre GARRAUD
Lolium perenne L. · Perennial ryegrass
DLF Seeds A/S
x Triticosecale Wittm. ex A. Camus · Triticale
SAATZUCHT STRENG-ENGELEN GMBH&CO. KG
Triticum aestivum L. · Bread wheat
Danko Hodowla Roslin Sp.z.o.o.
x Triticosecale Wittm. ex A. Camus · Triticale
PZO Pflanzenzucht (DE)
Triticum aestivum L. · Bread wheat
Peter Franck
Rosa L. · Rose
Rosen-Tantau Mathias Tantau Nachfolger
Hordeum vulgare L. · Barley
Syngenta Participations AG
Fragaria L. · Strawberry
Ronald J. McNicol
x Triticosecale Wittm. ex A. Camus · Triticale
Nordsaat Saatzucht GmbH Saatzucht Langenstein
Triticum aestivum L. · Bread wheat
Syngenta UK Ltd
Verbena L. · Vervain
TAMURA| Yuij Tamura c/o Suntory Ltd., Flower Div. / SAKAZAKI| Ushio Sakazaki c/o Suntory Ltd., Flower Div. / TACHIBANA| Ryuich Tachibana c/o Suntory Ltd.
Beta vulgaris Sugar Beet Group · Sugar beet
Masfeld John
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
The Regents of the University of California (US)
Hordeum vulgare L. · Barley
Syngenta UK Ltd
Pisum sativum L. · Pea
Innoseeds B.V.
Triticum durum Desf. · Durum wheat
RAGT 2N S.A.S