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.
x Triticosecale Wittm. ex A. Camus · Triticale
Institut national de recherche pour l'agriculture, l'aliment (FR)/Agri Obtentions SA (FR)
x Triticosecale Wittm. ex A. Camus · Triticale
Institut national de recherche pour l'agriculture, l'aliment (FR)/Agri Obtentions SA (FR)
Hordeum vulgare L. · Barley
Hodowla Roslin Smolice Sp.z o.o Grupa IHAR
Solanum lycopersicum L. · Tomato
HAZERA SEEDS BV
Cucurbita pepo L. · Field pumpkin
Pischinger Leopold
Vitis L. · Grapevine
Prof. Ing. Vilém Kraus, CSc. (CZ)/Doc. Ing. Miloš Michlovský, CSc. (CZ)/Lubomír Glos (CZ)/Vlastimil Peřina (CZ)
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Cucurbita pepo L. · Field pumpkin
Enza Zaden Beheer B.V.
Triticum aestivum L. · Bread wheat
Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych, Basanets` Hanna Stepanivna, Vlasenko Volodymyr Anatoliiovych, Kolomiiets` Lidiia Andriivna, Zhyvotkov Leonid Oleksandrovych, Shelepov Volodymyr Vasyl`ovych, Remeslo Volodymyr Vasyl`ovych,
Avena sativa L. · Oat
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Malus domestica (Suckow) Borkh. · Apple
Domaine Public (FR)
Malus domestica (Suckow) Borkh. · Apple
BURCHARDT (DE)
Malus domestica (Suckow) Borkh. · Apple
Malus domestica (Suckow) Borkh. · Apple
Dalival SAS (FR)
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Gerbera L. · Gerbera
Boerlage, P.
Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon
Syngenta Seeds B.V.
Raphanus sativus L. var. sativus · Radish
Bejo Zaden B.V.
Triticum aestivum L. · Bread wheat
RAGT 2N S.A.S
x Triticosecale Wittm. ex A. Camus · Triticale
RAGT 2N S.A.S
Malus domestica (Suckow) Borkh. · Apple
SHELL F.A. (US)
Beta vulgaris Garden Beet Group · Garden beet
UNITED GENETICS SEEDS CO
Avena sativa L. · Oat
SEMILLAS BATLLE, S.A.
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR