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 L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Triticum aestivum L. · Bread wheat
Danko Hodowla Roslin Sp.z.o.o.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Cucumis melo L. · Melon
Moshe Zalsman
Hordeum vulgare L. · Barley
CSIC/SEMILLAS BATLLE
Cucumis sativus L. · Cucumber
CAPITAL GENETIC EBT, S.L.
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Triticum aestivum L. · Bread wheat
Luchna Inna Stanislavivna, Usova Zoia Vasylivna, Iodkovskyi Vladislav Zdislavovych, Riabchun Nataliia Ivanivna, Yel`nikov Mykola Ivanovych, Zviahin Andrii Fedorovych,
Secale cereale L. · Rye
Danko Hodowla Roslin Sp.z.o.o.
Cucumis melo L. · Melon
Shevchenko Igor
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Humulus lupulus L. · Common hop
Anton Lutz
Vitis vinifera L. · Common grape vine
Vivai Cooperativi di Rauscedo (VCR)
hybrids between Cucumis ficifolius and Cucumis myriocarpus Naudin
María Carmen Gisbert Doménech^^^María Belén Picó Sirvent
Cucumis sativus L. · Cucumber
Petr Klapshte, Petr Horal, Yirzhi Horal,
Triticum aestivum L. · Bread wheat
Oks`om Volodymyr Polikarpovych, Morhun Bohdan Volodymyrovych, Skrypl`ov Volodymyr Vasyl`ovych, Morhun Volodymyr Vasyl`ovych,
Cucumis sativus L. · Cucumber
Muzhylko Viktor Valentynovych, Husieva Liudmyla Ivanivna, Horokhovs`kyi Vitalii Fedorovych,
Triticum durum Desf. · Durum wheat
Moroz Oleh Vasylovych, Moshenko Mykola Mykolaiovych, Roik Mykola Volodymyrovych,
Ribes uva-crispa L. · Gooseberry
Shestopal Halyna Serhiivna, Kopan Volodymyr Pavlovych, Kopan` Kira Mykolaivna,
Vitis vinifera L. · Common grape vine
Naumenko Mykola Pavlovych, Kutal`ova Tetiana Serhiivna, Chebanenko IEvheniia Pavlivna,
Triticum aestivum L. · Bread wheat
Marynka Svitlana Mykolaivna, Shelepov Volodymyr Vasyl`ovych, Chebakov Mykola Petrovych, Vlasenko Volodymyr Anatoliiovych, Ulich Oleksandr Leonidovych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych,
Cucumis sativus L. · Cucumber
Milotay Peter, Hodozy Sandor
Helianthus annuus L. · Sunflower
KOIPESOL SEMILLAS, S.A.