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.
Vitis vinifera L. · Common grape vine
Valentin Blattner-Haefeli und Frau Silvia
x Triticosecale Wittm. ex A. Camus · Triticale
Tromsiuk Valentyna Dmytrivna, Bortnovskyi Vitalii Mykolaiovych, Lilyk Tetiana Volodymyrivna, Buhaiov Vasyl Dmytrovych,
Cucumis sativus L. · Cucumber
Dymchenko Tetiana Mykolaivna, Muzhylko Viktor Valentynovych,
Lactuca sativa L. var. crispa L. · Leaf lettuce
H.Margiel-Migdal
Vitis vinifera L. · Common grape vine
Dr. Norbert Becker im Staatl. Weinbauinstitut
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
Dr. Norbert Becker im Staatl. Weinbauinstitut
Vitis vinifera L. · Common grape vine
Valentin Blattner-Haefeli und Frau Silvia
Triticum aestivum L. · Bread wheat
Koliuchyi Vasyl` Trokhymovych, Kovalyshyna Hanna Mykolaivna, Siroshtan Andrii Anatoliiovych, Zamlila Nina Petrivna, Volohdina Halyna Borysivna, Humeniuk Oleksandr Volodymyrovych, Kochmarskyi Valentyn Serhiiovych,
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Helianthus annuus L. · Sunflower
Makov`eva Nadiia Petrivna, Kusch Viacheslav Stepanovych, Herasymenko Oksana Oleksandrivna, Pershyna Liliia Vasylivna, Dymytrov Heorhii Demianovych, Skakun Vadym Mykhailovych,
Malus domestica (Suckow) Borkh. · Apple
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Triticum aestivum L. · Bread wheat
Bc Institut d.d. Zagreb (HR)
Cucumis melo L. · Melon
SEMILLAS FITO, S.A.
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Vitis vinifera L. · Common grape vine
Institut National de la Recherche Agronomique (FR)/Sicarex Beaujolais (FR)
Poa pratensis L. · Kentucky bluegrass
WARREN'S TURF NURSERY INC (US)
Ribes nigrum L. · Blackcurrant
Gospodarstwo Ogrodnicze Wiesław Błocki
Triticum monococcum L. · Einkorn wheat
Vörös Géza, Héreg
Hordeum vulgare L. · Barley
Lantmännen SW Seed
Cichorium intybus L. · Chicory
Hoquet Endives (FR)
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Capsicum annuum L. · Bell pepper
Harmoniz