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
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Triticum aestivum L. · Bread wheat
Viichenko Ol`ha Ivanivna, Vasylenko Taisiia Fedorivna, Radchenko Ihor Mykolaiovych,
Triticum aestivum L. · Bread wheat
Marynka Svitlana Mykolaivna, Kolotsiiets` Lidiia Andriivna, Chebakov Mykola Petrovych, Shelepov Volodymyr Vasyl`ovych, Vlasenko Volodymyr Anatoliiovych, Ulich Oleksandr Leonidovych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymy
Medicago sativa L. · Alfalfa
STEUCKARDT| Dr. Rudolf Steuckardt in Fa. Saatzucht Gotha-Friedrichswerth GmbH / KOHLS| Dipl.agr.Ing. Dieter Kohls VEG Pflanzenproduktionen / SCHIEFER| Dr. Schiefer in Fa. Saatzucht Plaussig GmbH
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
HÖHERE BUNDESLEHRANSTALT UND BUNDESAMT FÜR WEIN UND OBSTBAU
Pisum sativum L. · Pea
DIEGO RUBIALES OLMEDO/Mª JOSE COBOS VAZQUEZ
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
Prof. Dr. H. Becker
Vitis vinifera L. · Common grape vine
Z. Nakov, V. Valchev, M. Ivanov, V. Tsvetkov, V. Haygarov, T. Yoncheva
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Rosa L. · Rose
Paul Pekmez (FR)
Rosa L. · Rose
KORDES' SOEHNE| W. Kordes' Soehne Rosenschulen GmbH & Co KG
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Hordeum vulgare L. · Barley
Polishcuk Tetiana Petrivna, Rusanov Volodymyr Ivanovych, Kavunets` Valerii Petrovych, Kovalyshyna Hanna Mykolaivna, Vasylenko Nadiia Vasylivna, Shubenko Nadiia Vasylivna, Hudzenko Volodymyr Mykolaiovych, Kuz`menko Halyna Iosypivna, Kochmarskyi Valentyn Se
Malus domestica (Suckow) Borkh. · Apple
Gospodarstwo Szkółkarskie Andrzej i Szymon Nowakowscy
Triticum aestivum L. · Bread wheat
Artemchuk Iryna Petrivna, Morhun Volodymyr Vasylovych, Bershads`ka Liudmyla Petrivna, Kavunets` Valerii Petrovych, Vlasenko Volodymyr Anatoliiovych, Koliuchyi Vasyl` Trokhymovych, Basanets` Hanna Stepanivna, Shelepov Volodymyr Vasyl`ovych, Kyrylenko Vira
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Cucumis melo L. · Melon
PEOTEC SEEDS SRL
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Vitis vinifera L. · Common grape vine
Roshka Nataliia Anatoliivna, Oliinykov Mykolai Petrovych, Melkonian Misak Vaharshakovych, Klymenko Viktor Pavlovych, Volynkin Volodymyr Oleksandrovych,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.