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.
Cucumis sativus L. · Cucumber
Suvorova Tetiana IAkovlivna, Khomchenko Nina Mykolaivna, Shevkunov Valerii Mykolaiovych, Shamshyna Hanna Viacheslavivna, Portiankin Oleksii IEvhenovych, Havrysh Serhii Fedorovych,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Avena sativa L. · Oat
Hodowla Roślin Borów sp. z o.o.
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Ribes nigrum L. · Blackcurrant
Gospodarstwo Ogrodnicze Jerzy Wilczewski
Capsicum annuum L. · Bell pepper
ISI SEMENTI SPA
Triticum aestivum L. · Bread wheat
Lebiedieva Halyna Danylivna, Chebakov Mykola Petrovych, Shelepov Volodymyr Vasyl`ovych, Vlasenko Volodymyr Anatoliiovych, Ulich Oleksandr Leonidovych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych,
Corylus avellana L. · Common hazel
Matviienko, Mykola Khodakivska, IuliiaBublyk, Mykola
Rosa L. · Rose
Stanisław Żyła
Festuca trachyphylla (Hack.) Hack. · Hard fescue
BARENBRUG HOLLAND| Barenbrug Holland B.V. (Variety Administration)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Lolium x hybridum Hausskn. · Hybrid ryegrass
BARENBRUG HOLLAND
Rosa L. · Rose
Beate Wilczynski
Ribes rubrum L. · Redcurrant
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Petunia Juss. · Petunia
Výzkumný ústav pro krajinu, v. v. i. (CZ)
Cucumis sativus L. · Cucumber
Dymchenko Tetiana Mykolaivna, Muzhylko Viktor Valentynovych,
Ribes nigrum L. · Blackcurrant
Gospodarstwo Ogrodnicze Wiesław Błocki
Triticum aestivum L. subsp. spelta (L.) Thell. · Spelt
KLING| Dr. Christoph Kling in Universitaet Hohenheim - Landessaatzuchtanstalt -
Ribes nigrum L. · Blackcurrant
Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Cucumis sativus L. · Cucumber
IBEROSEEDS COMPAÑIA IBERICA DE SEMILLAS, S.L.
Cucumis sativus L. · Cucumber
Jesus Abad
Triticum aestivum L. · Bread wheat
Babenko Serhii Mykolaiovych, Teteruk Oleksii Volodymyrovych, Hal`chenko Nataliia Mykolaivna, Lazer Petro Nartsysovych, Nyzheholenko Viktor Mykhailovych, Naidonov Viktor Hryhorovych, Naid`onova Vira Opanasivna, Bazalii Valerii Vasyl`ovych,
Vitis vinifera L. · Common grape vine
AKTIONSGEMEINSCHAFT| Aktionsgemeinschaft zur Erhaltung von Rebsorten e.V. im DLR Rheinhessen-Nahe-Hunsrueck