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.
Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage
Shcevchenko Igor
Secale cereale L. · Rye
Romaniuk Oksana Oleksandrivna, Kornieieva Myroslava Oleksandrivna, Roik Mykola Volodymyrovych, Vakulenko Mykola Oleksandrovych, Mazur Zoia Oleksandrivna,
Triticum aestivum L. · Bread wheat
Babushkina Tetiana Viktorivna, Usova Zoia Vasylivna, Zviahintseva Anna Mykolaivna, Holik Oleh Viktorovych,
Triticum aestivum L. · Bread wheat
Oksom Volodymyr Polikarpovych, Morhun Bohdan Volodymyrovych, Katerynchuk Oleksandr Mykhailovych, Morhun Volodymyr Vasylovych,
Triticum aestivum L. · Bread wheat
Havryliuk Mykola Mykytovych, Oksom Volodymyr Polikarpovych, Morhun Volodymyr Vasylovych,
Hordeum vulgare L. · Barley
Wiersum Plantbreeding B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Triticum aestivum L. subsp. spelta (L.) Thell. · Spelt
Burdeniuk-Tarasevych Larysa Antonivna
Cucumis sativus L. · Cucumber
Shevchenko Igor
Hordeum vulgare L. · Barley
Smolii Svitlana Ivanivna, Nezhbirska Liudmyla Ivanivna, Korniichuk Oleksandr Vasylovych, Doroshcuk Vasyl Oleksiiovych, Mareniuk Oleksandr Borysovych,
Cucumis sativus L. · Cucumber
Shevchenko Igor
Vitis vinifera L. · Common grape vine
Dr. Rudolf Eibach / Prof. Dr. Reinhard Töpfer
Cucumis melo L. · Melon
Shevchenko Igor
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Cucumis melo L. · Melon
Shevchenko Igor
Solanum lycopersicum L. · Tomato
Harmoniz
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Vitis vinifera L. · Common grape vine
Jean Luc Viaud (FR)
Secale cereale L. · Rye
Danko Hodowla Roslin Sp.z.o.o.
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Triticum aestivum L. · Bread wheat
Oks`om Volodymyr Polikarpovych, Artemchuk Iryna Petrivna, Morhun Bohdan Volodymyrovych, Morhun Volodymyr Vasyl`ovych,
Triticum aestivum L. · Bread wheat
PIONEER OVERSEAS CORPORATION US
Cucumis melo L. · Melon
RAMIRO ARNEDO, S.A.
Triticum aestivum L. · Bread wheat
Dubovyk Nataliia Serhiivna, Yurchenko Tetiana Vasylivna, Siroshtan Andrii Anatoliiovych, Zamlila Nina Petrivna, Humeniuk Oleksandr Volodymyrovych, Chernov Oleh Vasyl`ovych, Kochmars`kyi Valentyn Serhiiovych,