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.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Avena sativa L. · Oat
Tarasenko Oleksandr Anatoliiovych, Sten`ko Volodymyr Illich, Solodushko Vira Pylypivna, Liaschenko Oleksandr Ivanovych,
Cucumis sativus L. · Cucumber
TAKII EUROPE B V
Cucumis sativus L. · Cucumber
Arkadiusz Labrzycki
Vitis vinifera L. · Common grape vine
Kostiuk Oleksii Nikiforovych, Dokuchaieva IEvheniia Mykolaivna, Tsebrii Mykhailo Petrovych, Aivazian Petros Karapetovych,
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Triticum aestivum L. · Bread wheat
Strube Research GmbH&Co KG
Ribes nigrum L. · Blackcurrant
Institut Sadiwnictwa Ukrainska Akademija Agrarnich Nauk Volodymyr Kopan
Triticum aestivum L. subsp. aestivum · Bread wheat
SAATZUCHT SCHWEIGER GBR
Triticum aestivum L. · Bread wheat
Skryplov Volodymyr Oleksandrovych, Morhun Bohdan Volodymyrovych, Bratuschak Serhii Petrovych, Artemchuk Iryna Petrivna, Morhun Volodymyr Vasylovych,
Daucus carota L. · Carrot
Vilmorin-Mikado
Triticum aestivum L. · Bread wheat
Caussade Semences SA (FR)
Cucumis sativus L. · Cucumber
Harris Moran Seed Company (USA) (US)
Malus domestica (Suckow) Borkh. · Apple
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Cucumis sativus L. · Cucumber
Ab Van Ende, Kiis Van de Maas,
Hordeum vulgare L. · Barley
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Triticum aestivum L. · Bread wheat
Volohdina Halyna Borysivna, Cheremkha Olena Maksymivna, Zamlila Nina Petrivna, Sorokin Volodymyr Valentynovych, Lebedeva Halyna Denysivna, Derhachov Oleksandr Leonidovych, Chebakov Mykola Petrovych, Zhyvotkov Leonid Oleksandrovych, Ulich Oleksandr Leonido
Triticum aestivum L. · Bread wheat
Khomenko Svitlana Olehivna, Marynka Svitlana Mykolaivna, Basanets` Hanna Stepanivna, Kolomiiets` Lidiia Andriivna, Vlasenko Volodymyr Anatoliiovych, Artemchuk Iryna Petrivna, Morhun Volodymyr Vasylovych,
Hordeum vulgare L. · Barley
Savranchuk Volodymyr Viktorovych, Mel`nychenko Mykhailo Leontiiovych,
Vitis vinifera L. · Common grape vine
Dr. Norbert Becker im Staatl. Weinbauinstitut
Triticum aestivum L. · Bread wheat
PLANT BREEDING INTERNATIONAL CAMBRIDGE
Ribes nigrum L. · Blackcurrant
Kopan Volodymyr Pavlovych, Kopan` Kira Mykolaivna,
Triticum aestivum L. · Bread wheat
Ushkarenko Viktor Oleksandrovych, Ranchevych Peter, Orliuk Anatolii Pavlovych, Lazer Petro Nartsysovych, Zhuzha Oleksandr Dmytrovych, Denchych Serbi Slav, Bazalii Valerii Vasyl`ovych,
Triticum aestivum L. · Bread wheat
Shcypak Vasyl Hennadiiovych, Shcypak Vasyl Vasylovych, Maliienko Mykola Vasylovych, Shcypak Hennadii Vasylovych,