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
Vioslav Momchilovich, Novo Przhuli,
Hordeum vulgare L. · Barley
SAATZUCHTWIRTSCHAFT OTTO BREUSTEDT GMBH
Triticum aestivum L. · Bread wheat
LEMAIRE DEFFONTAINES SEMENCES
Avena sativa L. · Oat
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Triticum aestivum L. · Bread wheat
Sejet Planteforaedling I,S
Vitis L. · Grapevine
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Hordeum vulgare L. · Barley
EWERTSON/LUNDIN
Spinacia oleracea L. · Spinach
VILMORIN, S.A.
x Triticosecale Wittm. ex A. Camus · Triticale
Danko Hodowla Roslin Sp.z.o.o.
Pisum sativum L. · Pea
Danko Hodowla Roslin Sp z.o.o. (PL)
Solanum lycopersicum L. · Tomato
Bernardus van den Bosch
Cucurbita maxima Duchesne · Giant pumpkin
Ralf Kuijpers
Avena sativa L. · Oat
Aberystwyth University (IBERS)
Veronica L. · Speedwell
POTTER| G.D. Potter c/o Rockhans-Nurseries
Brassica oleracea L. (Brussels Sprouts Group) · Brussels sprouts
Elsoms Seeds
Pisum sativum L. · Pea
Rijpko Lambertus Jan Mansholt
Cucumis sativus L. · Cucumber
HAZERA GENETICS
Pisum sativum L. · Pea
ZKI, H
Cucumis sativus L. · Cucumber
Seminis Vegetable Seeds
x Triticosecale Wittm. ex A. Camus · Triticale
WOLSKI| Dr.Tadeusz Wolski c/o SHR Laski / BRYKCZYNSKA| Lidia Brykczynska c/o SHR Choryn / SZOLKOWSKI| Andrzej Szolkowski c/o SHR Choryn / BANASZAK| Zofia Banaszak c/o "DANKO" Hodowla Roslin sp. z o.o.
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Malus domestica (Suckow) Borkh. · Apple
Cucumis sativus L. · Cucumber
Selekcijos ir sėklininkystės firma ,,Manul"