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
Malopolska Hodowla Roslin Spolka z o.o.
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Triticum aestivum L. · Bread wheat
Humeniuk Oleksandr Volodymyrovych, Dubovyk Dmytro Yuriiovych, Bulavka Nataliia Vasylivna, Pirych Alina Volodymyrivna, Derhachov Oleksandr Leonidovych, Zamlila Nina Petrivna, Kochmarskyi Valentyn Serhiiovych, Demydov Oleksandr Anatoliiovych, Volohdina Haly
Vitis vinifera L. · Common grape vine
INCONNU (FR)
x Triticosecale Wittm. ex A. Camus · Triticale
Chernobab Raisa Andriivna, Melnyk Vira Serhiivna, Chernobai Serhii Volodymyrovych, Shcypak Hennadii Vasylovych,
Triticum aestivum L. · Bread wheat
Balla Laszlo / Bedoe Zoltan / Lang Laszlo / Szunics Laszlo / Szunics Laszlone
Vitis vinifera L. · Common grape vine
Dr. Johannes Zimmermann
Rosa L. · Rose
Ralf MOORE (US)
Humulus lupulus L. · Common hop
Bayerische Landesanstalt (DE)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Triticum L. · Wheat
BORASIO ERCOLE
Cucumis sativus L. · Cucumber
Hary Bessels
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Rosa L. · Rose
Uniwersytet Przyrodniczy w Poznaniu
Cucumis melo L. · Melon
Shevchenko Andrii Oleksiiovych
Cucumis melo L. · Melon
MERIDIEM SEEDS S.L.
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Rosa L. · Rose
ALAIN ANTOINE MEILLAND (FR)
Rosa L. · Rose
ALAIN ANTOINE MEILLAND (FR)
Rosa L. · Rose
ALAIN ANTOINE MEILLAND (FR)
Rosa L. · Rose
Wielkopolska Hodowla Roślin Ogrodniczych
Vitis L. · Grapevine
Miroslav Ivanov, Iliyan Simeonov, Anatoli Iliev
Ribes nigrum L. · Blackcurrant
Tereshcenko IAna IUriivna, Yareshcenko Oleksandr Mykolaiovych,
Malus domestica (Suckow) Borkh. · Apple
Homeniuk Svitlana Viktorivna, Chupryniuk Viktor IAkovych,