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.
Prunus mira Koehne
Kriukova Iryna Vadymivna, Komar-Temna Larysa Dmitrivna,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
LAND BAYERN WUERZBURG| Land Bayern, vertreten durch Bayerische Landesanstalt fuer Weinbau und Gartenbau - Abt. Weinbau und Oenologie -
Triticum aestivum L. · Bread wheat
Datsenko IElyzaveta Kostiantynivna, Datsenko Anatolii Mykhailovych,
Cucumis sativus L. · Cucumber
Khenk van Kooten
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Capsicum annuum L. · Bell pepper
Syngenta Crop Protection AG
Cucumis sativus L. · Cucumber
Gari Besels
Triticum aestivum L. · Bread wheat
Parfeniuk Alla Ivanivna, Lisovyi Mykhailo Pavlovych, Dubyna Larysa Viktorivna, Vlasenko Volodymyr Anatoliiovych, Kolomiiets` Lidiia Andriivna, Zhyvotkov Leonid Oleksandrovych, Shelepov Volodymyr Vasyl`ovych,
Rosa L. · Rose
Sam McGredy
Cucumis melo L. · Melon
SEMILLAS FITO, S.A.
Cucumis melo L. · Melon
SEMILLAS FITO, S.A.
Cucumis melo L. · Melon
Henrikh IUst
Malus domestica (Suckow) Borkh. · Apple
Information not available - Contact NL authorities
Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon
Luk'ianchykova Oksana Anatoliivna, Pluzhnikova Liudmyla IEhorivna, Lisitsyn Volodymyr Mykolaiovych, Loboda Olena Mykolaivna, Serhiienko Oksana Volodymyrivna,
Vitis vinifera L. · Common grape vine
Gunvaldis Ilgvars Vesmins
Triticum aestivum L. subsp. aestivum · Bread wheat
HADMERSLEBEN| Syngenta Hadmersleben GmbH
Capsicum annuum L. · Bell pepper
Mr. Basterreix
Triticum aestivum L. · Bread wheat
Limagrain Europe, FR
Pisum sativum L. · Pea
LABOULET SEMENCES
Rosa L. · Rose
Louis LENS (BE)
Vitis L. · Grapevine
INCONNU (FR)
Cucurbita moschata Duchesne · Butternut squash
UNITED GENETICS SEEDS CO
Capsicum annuum L. · Bell pepper
SEMILLAS FITO, S.A.