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.
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Helianthus annuus L. · Sunflower
Kapustian Maryna Viktorivna, Kapustian Volodymyr Vasylovych,
Beta vulgaris Sugar Beet Group · Sugar beet
Stefaan Horemans
Vitis vinifera L. · Common grape vine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Rosa L. · Rose
Robert Louis Laperriere (FR)
Rosa x damascena Mill. · Damask rose
Hryschenko Lidiia Oleksandrivna, Nazarenko Leonid Hryhorovych,
Cucurbita moschata Duchesne · Butternut squash
Domaine Public (FR)
Vitis vinifera L. · Common grape vine
AGRICULTURAL RESEARCH ORG
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Triticum aestivum L. · Bread wheat
Artemchuk Iryna Petrivna, Oks`om Volodymyr Polikarpovych, Morhun Volodymyr Vasyl`ovych,
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Ribes uva-crispa L. · Gooseberry
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Hordeum vulgare L. · Barley
Limagrain Europe, FR
Triticum aestivum L. · Bread wheat
Nina Pfeiffer, Erhard Ebmeyer
Cucumis sativus L. · Cucumber
Kees Reinink
Triticum aestivum L. · Bread wheat
Kovalyshyna Hanna Mykolaivna, Kavunets` Valerii Petrovych, Koliuchyi Vasyl` Trokhymovych, Humeniuk Oleksandr Volodymyrovych, Marynka Svitlana Mykolaivna, Khomenko Svitlana Olehivna, Basanets` Hanna Stepanivna, Kyrylenko Vira Viktorivna, Kochmarskyi Valent
Triticum aestivum L. · Bread wheat
AGR. LIC. JÖRGEN LÖHDE C/O SV. WEIB.
Cucurbita pepo L. · Field pumpkin
HM.CLAUSE
Triticum durum Desf. · Durum wheat
Holik Oleh Viktorovych, Bohuslavskyi Roman Lvovych, Didenko Svitlana Yuriivna, Babushkina Tetiana Viktorivna, Zviahintseva Anna Mykolaivna
Vitis vinifera L. · Common grape vine
Oliinykov Mykolai Petrovych, Klymenko Viktor Pavlovych, Melkonian Misak Vaharshakovych, Volynkin Volodymyr Oleksandrovych,
Vitis vinifera L. · Common grape vine
Mincho Kondarev, Dimitar Prodanski, Ivanka Boneva, Stoyan Kukunov, Penka Georgieva, Stoyanka Krastanova
Prunus persica (L.) Batsch · Peach
Fedorova Ol`ha Stepanivna, Lobanovs`ka Valentyna Fedorivna, Latsko Tetiana Anatoliivna, Perfil`ieva Zoia Mykolaivna, Smykov Anatolii Volodymyrivna, Smykov Volodymyr Karpovych,
Lactuca sativa L. · Lettuce
Gautier Semences SAS (FR)