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.
Hordeum vulgare L. · Barley
Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy
Ribes nigrum L. · Blackcurrant
Yareshcenko Oleksandr Mykolaiovych, Kopan Volodymyr Pavlovych, Kopan` Kira Mykolaivna,
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Cucurbita pepo L. · Field pumpkin
NEUMAN Seed International (US)
Ribes rubrum L. · Redcurrant
Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas
Cucumis melo L. · Melon
MERIDIEM SEEDS S.L.
Triticum aestivum L. · Bread wheat
DRS/WINZELE/SAUREV/WILENM
Vitis vinifera L. · Common grape vine
Abliazova Aia Pavlivna, Tulaieva Maiia Ivanivna, Kostiuk Oleksii Nikiforovych, Dokuchaieva IEvheniia Mykolaivna, Tsebrii Mykhailo Petrovych, Aivazian Petros Karapetovych,
Hordeum vulgare L. · Barley
LISSY KUNTZE
Fragaria L. · Strawberry
FAEDI WALTER
Phaseolus vulgaris L. · Common bean
Tymoshenko Oleksandr Oleksiiovych, Shcerbyna Olena Zinoviivna, Romaniuk Lidiia Serhiivna,
Acer campestre L.
Laanboomkwekerij & Handveredelingsbedrijf Mart Brugel B.V.
Rosa L. · Rose
Reinhard Noack
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Triticum aestivum L. · Bread wheat
Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy
Hordeum vulgare L. · Barley
VON RUMKER (DE)
Triticum aestivum L. · Bread wheat
Artemchuk Iryna Petrivna, Morhun Volodymyr Vasylovych,
Cucurbita pepo L. · Field pumpkin
Daniel Gabillard
Vitis L. · Grapevine
Miroslav Ivanov, Iliyan Simeonov, Anatoli Iliev
Prunus persica (L.) Batsch · Peach
Fedorova Ol`ha Stepanivna, Smykov Volodymyr Karpovych, Smykov Anatolii Volodymyrovych, Parfil`ieva Zoia Mykolaivna,
Cucumis melo L. · Melon
Ruban Natalia Hryhorivna, Lymar Anatolii Ostapovych, Frolov Volodymyr Vasyl`ovych,
Triticum aestivum L. · Bread wheat
Boryslav Kobyl`sky, Srbyslav Denchych,
Vitis vinifera L. · Common grape vine
Molchanova IUliia Vasylivna, Salii Olena Vasylivna, Herus Liudmyla Vasylivna, Kovalova Iryna Anatoliivna, Bankovska Mariia Hryhorivna, Tulaieva Maiia Ivanivna, Vlasov Viacheslav Vsevolodovych,
Cucumis melo L. · Melon
Moshe Zalsman