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.
Triticum aestivum L. · Bread wheat
Khomenko Svitlana Olehivna, Marynka Svitlana Mykolaivna, Shelepov Volodymyr Vasyl`ovych, Kolomiiets` Lidiia Andriivna, Vlasenko Volodymyr Anatoliiovych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych,
Triticum aestivum L. · Bread wheat
Markova Tetiana IUriivna, Rohulina Larysa Vasylivna, Iodkovs`kyi Vladyslav Zdyslavovych, Riabchun Nataliia Ivanivna, Zviahin Andrii Fedorovych, Yel`nikov Mykola Ivanovych,
Rosa L. · Rose
Weeks Roses (US)
Vitis vinifera L. · Common grape vine
AGACAL-ESTACION DE VITICULTURA E ENOLOXIA DE GALICIA
Cucurbita pepo L. · Field pumpkin
HM.CLAUSE
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Malus domestica (Suckow) Borkh. · Apple
Homeniuk Svitlana Viktorivna, Chupryniuk Viktor IAkovych,
Triticum aestivum L. · Bread wheat
Nefedov IUrii Inokentiiovych, Lebedieva Halyna Danylivna, Chebakov Mykola Petrovych,
Triticum durum Desf. · Durum wheat
Washington State University Research Foundation (US)
Lactuca sativa L. · Lettuce
Syngenta Crop Protection AG
Hordeum vulgare L. · Barley
Cebeco Handelsraad (NL)
Cucumis melo L. · Melon
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Hordeum vulgare L. · Barley
Probstdorfer Saatzucht Ges.m.b.H & Co KG
Triticum aestivum L. · Bread wheat
Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych, Khomenko Svitlana Olehivna, Kyrylenko Vira Viktorivna, Marynka Svitlana Mykolaivna, Bershads`ka Liudmyla Petrivna, Basanets` Hanna Stepanivna, Holyk Liubov Mykolaivna, Dubovyi Volodymyr Ivanovyc
Cucumis sativus L. · Cucumber
Seminis Vegetable Seeds (NL)
Triticum aestivum L. · Bread wheat
Oks`om Liudmyla Leonidivna, Oks`om Volodymyr Polikarpovych, Morhun Volodymyr Vasyl`ovych,
Ribes nigrum L. · Blackcurrant
Institut Sadiwnictwa Ukrainska Akademija Agrarnich Nauk Volodymyr Kopan
Triticum aestivum L. · Bread wheat
Chebakov Mykola Petrovych, Shelepov Volodymyr Vasyl`ovych, Vlasenko Volodymyr Anatoliiovych, Zhyvotkov Leonid Oleksandrovych, Ulich Oleksandr Leonidovych, Artemchuk Iryna Petrivna, Lohvynenko Valentyna Fedorivna, Morhun Volodymyr Vasylovych,
Pisum sativum L. · Pea
Yanivs`kyi Ihor Mykolaiovych, Bodnarenko Klavdiia Borysivna, Ukrainets` Viktor Valentynovych, Kaz`miruk Halyna Fedorivna, Stebnovs`ka Anzhela IAkymivna, Kaliuzhna Emiliia Al`oziivna, Kuz` Vasyl` Volodymyrovych, Rozvadovs`kyi Al`ozii Martynovych,
Cucumis sativus L. · Cucumber
Havrysh Serhii Fedorovych, Dubinin Serhii Volodymyrovych,
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Cucumis sativus L. · Cucumber
Mashtakov Mykola Oleksiiovych, Mashkova Hanna Kharlampiievna, Mashtakov Oleksii Oleksiiovych, Dubinin Serhii Volodymyrovych,
Hordeum vulgare L. · Barley
S. Zapryanov, T. Stefanov, Y. Burlezova, S. Navushtanov, N. Lazarov, V. Mincheva, D. Lazarova, S. Staykova