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
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Cucumis sativus L. · Cucumber
Hazera Genetics Ltd (IL)
Malus domestica (Suckow) Borkh. · Apple
Domaine Public (FR)
Cucurbita pepo L. · Field pumpkin
UNITED GENETICS SEEDS CO
Cucumis melo L. · Melon
Sakata Vegetables Europe SARL (FR)
Cucurbita pepo L. · Field pumpkin
Gautier Semences SAS (FR)
Solanum lycopersicum L. · Tomato
agro- Tip Handels-u. Consultingges. mbH
Cynara cardunculus L. · Cardoon
Domaine Public (FR)
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
MUSACCHI,BERNARDINI,MARCH
Solanum lycopersicum L. · Tomato
Monsanto Vegetable IP Management B.V.
Cucurbita pepo L. · Field pumpkin
UNITED GENETICS SEEDS CO
Cucumis melo L. · Melon
MINISTERO DELLE POLITICHE AGRICOLE E FORESTALI - DIREZIONE GENERALE DELLE POLITICHE AGRICOLE ED AGROINDUSTRIALI NAZIONALI
Hordeum vulgare L. · Barley
Sten`ko Volodymyr Illich, Tsykalenko Mykola Ivanovych, Romanenko Vasyl` Ivanovych,
Malus Mill. · Apple
Jaroslav Tupy Institute of Experimental Botany
Triticum aestivum L. · Bread wheat
Kärntner Saatbau e.Gen.
Pisum sativum L. · Pea
Výzkumné Centrum Selton s.r.o., Selgen A.S.
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon
W. LEGUTKO PRZEDSIEBIORSTWO HODOWLANO NASIENNE SP.Z.O.O
Solanum lycopersicum L. · Tomato
Axia Vegetable Seeds B.V.
Malus Mill. · Apple
Jaroslav Tupy Institute of Experimental Botany / Otto Louda Institute of Experimental Botany
Ribes L. · Currants
RIETSEMA (NL)
Hordeum vulgare L. · Barley
Secobra Recherches S.A.
Rosa L. · Rose
SAPIA ADRIANO
Triticum aestivum L. · Bread wheat
Amt der Tiroler Landesregierung