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.
Ribes nigrum L. · Blackcurrant
Shylo Mykola Petrovych, Mamchenko Hennadii Serhiiovych,
Hordeum vulgare L. · Barley
KWS Momont Recherche Sarl
Triticum aestivum L. · Bread wheat
REINER BOTHE
Cucumis sativus L. · Cucumber
Havrysh Serhii Fedorovych, Dubinin Serhii Volodymyrovych,
Cucumis sativus L. · Cucumber
Shamshyna Anna Viacheslavovna, Portiankin Alieksei Evhenovych, Havrysh Serhii Fedorovych,
Ribes uva-crispa L. · Gooseberry
Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas
Corylus avellana L. · Common hazel
Zelenko Oleksii Anatoliiovych,Stets Mykhailo Ivanovych,Filonenko Oleksii Leonidovych,
Rosa L. · Rose
Chyzhankova Valentyna Ivanivna, Rubtsova Olena Leonidivna,
Astilbe simplicifolia Makino · Star astilbe
Mts. Holtmaat
Hordeum vulgare L. · Barley
CARLSBERG A/S
Cucumis melo L. · Melon
Maria-Angeles Benedi
Triticum durum Desf. · Durum wheat
ARIZONA PLANT BREEDERS
Ribes nigrum L. · Blackcurrant
Kopan` V.P., Kopan` K.N.,
Rosa L. · Rose
W. Kordes Sohne Rosenschulen GmbH & Co KG| DE
Triticum aestivum L. · Bread wheat
Yefremenkova Vira Ivanivna, Vasil`ieva Hanna Mykhailivna, Fomenko Nina Patelieievna, Vorobiova Raisa Ahafonivna, Shurovenkova Liudmyla Ivanivna, Kudriashov Ihor Mykolaiovych, Bespalova Liudmyla Andriivna, Soliarek Taisiia Fedorivna, Nabokov Henadii Dmytro
Cucumis melo L. · Melon
Nunhems B.V.
Triticum aestivum L. · Bread wheat
Ihnatovskyi Oleksandr Oleksandrovych, Khodakova Tetiana Mykolaivna, Reshetnikova Valentyna Semenivna, Aleksieienko IEvhenii Viktorovych, Honcharuk Nina Oleksandrivna, Lytvynenko Raisa Ivanivna, Holub IEvheniia Anatoliivna, Lytvynenko Mykola Antonovych,
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Rosa L. · Rose
Ruhe
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Rosa L. · Rose
FA. W. KORDES' SÖHNE
Triticum aestivum L. subsp. aestivum · Bread wheat
Kärntner Saatbau e.Gen.
Hordeum vulgare L. · Barley
Manziuk Vitalii Tymofiiovych, Fedorenko Vira Oleksandrivna, Naumov Oleksii Hermanovych, Vasko Nataliia Ivanivna, Kozachenko Mykhailo Romanovych,
Begonia x hiemalis Fotsch · Elatior Begonia
KOPPE L.H.| L. H. Koppe