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.
Rosa L. · Rose
Chyzhankova Valentyna Ivanivna, Rubtsova Olena Leonidivna,
Foeniculum vulgare Mill. · Fennel
Kondratenko Serhii Ivanovych, Chaban Lesia Vasylivna, Kasian Oleksandr Ivanovych, Pozniak Oleksandr Vasylovych,
Vitis vinifera L. · Common grape vine
N. Nedelchev, K. Stoev, M. Kondarev, Z. Zankov
Triticum aestivum L. · Bread wheat
Vasyliuk Petro Mykolaiovych, Siroshtan Andrii Anatoliiovych, Mukha Tetiana Ivanivna, Zamlila Nina Petrivna, Humeniuk Oleksandr Volodymyrovych, Kolomiiets` Lidiia Andriivna, Yurchenko Tetiana Vasylivna, Kharchenko Al`ona Vitaliivna, Kyrylenko Vira Viktoriv
Triticum aestivum L. · Bread wheat
Butchenko Ivan Illich, Shudria Petro Petrovych, Matviiets Volodymyr Hryhorovych,
Vitis vinifera L. · Common grape vine
Institut National de la Recherche Agronomique (FR)/Sicarex Beaujolais (FR)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Triticum aestivum L. · Bread wheat
Institut national de recherche pour l'agriculture, l'aliment (FR)/Agri Obtentions SA (FR)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Rosa L. · Rose
HETZEL| Karl Hetzel (+)
Triticum aestivum L. · Bread wheat
Agri Obtentions SA (FR)/Institut National de la Recherche Agronomique (FR)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Humulus lupulus L. · Common hop
Herbert Ehrmaier
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Cucumis melo L. · Melon
Ahmet Oktay Turhan
Triticum aestivum L. · Bread wheat
Barabas Zoltan / Kertesz Zoltan / Matuz Janos / Paradi Laszlo / Beke Bela / Schulz Jozsefne / Csoesz Laszlone / Bona Lajos
Beta vulgaris Fodder Beet Group · Mangelwurzel
Malopolska Hodowla Roslin Spolka z o.o.
Humulus lupulus L. · Common hop
GMELCH| Franz Gmelch / EHRMAIER| Herbert Ehrmaier
Cucurbita pepo L. · Field pumpkin
Bill Johnson
Cucurbita pepo L. · Field pumpkin
Lymar Anatolii Ostapovych, Kholodniak Oleh Heorhiiovych, Kholodniak Liubov Volodymyrivna,
Ribes nigrum L. · Blackcurrant
Lietuvos agrarinių ir miškų mokslų centras
Cucumis sativus L. · Cucumber
IBEROSEEDS COMPAÑIA IBERICA DE SEMILLAS, S.L.
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
x Triticosecale Wittm. ex A. Camus · Triticale
S.I.A.J. EXTREMADURA