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
STARYCHENKO VASYL MYKOLAIOVYCH, KOVALCHUK SERHII OLEKSANDROVYCH, KYRYLCHUK ANZHELA MYKOLAIVNA, HOLYK LIUBOV MYKOLAIVNA
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Avena sativa L. · Oat
LOCHOW-PETKUS
Vitis vinifera L. · Common grape vine
DUMA MIHAIILLE IONATANOANA MARIADUMA TIBERIUDUMA MARINVANC FILIPLUCA MIRELAPOPI MORODAN CORNELIU
x Triticosecale Wittm. ex A. Camus · Triticale
Lemaire Deffontaines (FR)
Fragaria L. · Strawberry
LEIS MICHELANGELO / MUSACCHI DARIO
Vitis vinifera L. · Common grape vine
Dr. Norbert Becker im Staatl. Weinbauinstitut
Malus domestica (Suckow) Borkh. · Apple
Hrytsenko Liubov Oleksandrivna, Chernenko Olena Ivanivna, Liapikhova Antonina Oleksandrivna,
Cucurbita moschata Duchesne · Butternut squash
Domaine Public (FR)
Cucumis melo L. · Melon
Sakata Vegetables Europe SAS (FR)
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Cucurbita maxima Duchesne · Giant pumpkin
RIJK ZWAAN Zaadteelt en Zaadhandel B.V.
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Cucumis sativus L. · Cucumber
Krylov Oleh Mykolaiovych, Borysov Oleksandr Volodymyrovych,
Triticum aestivum L. · Bread wheat
ABED FONDEN
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Prunus persica (L.) Batsch · Peach
VIVEROS PROVEDO, S.A.
Ribes nigrum L. · Blackcurrant
Horticulture Research International| GB
Malus Mill. · Apple
ALDWINCKLE HERB S. / LAMB ROBERT C.
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Fragaria L. · Strawberry
Julius Kühn-Institut Bundesforschungsinstitut für Kulturpfla
Hordeum vulgare L. · Barley
Florimond Desprez