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.
Triticum aestivum L. · Bread wheat
Bosakovska Nataliia IUriivna, Bredins`ka Nadiia Stepanivna, Babaiants Lazar Tihranovych, Nakonechnyi Mykola IUriiovych, Narhan Tetiana Pavlivna, Fedchenko Volodymyr Pavlovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypovych,
Triticum aestivum L. · Bread wheat
Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy
Hordeum vulgare L. · Barley
DEUTSCHE SAATGUTGESELLSCHAFT
Capsicum annuum L. · Bell pepper
Syngenta Crop Protection AG
Beta vulgaris Sugar Beet Group · Sugar beet
KUTNOWSKA HODOWLA BURAKA CUKROWEGO Sp.z o.o.
Capsicum annuum L. · Bell pepper
HM.Clause S.A.S.
Cucurbita moschata Duchesne · Butternut squash
Stephen Kammholz and Graham Dyche, Enza Zaden Beheer B.V.
Beta vulgaris Garden Beet Group · Garden beet
Hodowla Roslin Snowidza Sp.z.o.o
Lonicera caerulea L. var. kamtschatica Sevast. · Blue-berried honeysuckle
University of Saskatchewan, CAN
Triticum aestivum L. · Bread wheat
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Avena strigosa Schreb. · Black oat
Lammers Seed Options B.V.
Cucumis sativus L. · Cucumber
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Rosa L. · Rose
Zary Keith W.|Thousand Oaks, CA, US
Rosa L. · Rose
Zary Keith W.|Somis, CA
Cucumis melo L. · Melon
RAMIRO ARNEDO, S.A.
Cucumis melo L. · Melon
CAPITAL GENETIC EBT, S.L.
Triticum aestivum L. · Bread wheat
Nordic Seed A/S, 8464 Galten
Cucumis sativus L. · Cucumber
HAZERA SEEDS BV
Cucumis melo L. · Melon
MERIDIEM SEEDS S.L.
Cucumis sativus L. · Cucumber
A. Mihov, M. Aleksandrova, T. Petkova
Beta vulgaris Fodder Beet Group · Mangelwurzel
MARIBO SEED