Diseases
Peronosporaceae
Downy mildew is a dangerous plant disease caused by oomycetes under high humidity conditions. It manifests as a characteristic growth on the underside of leaves and spotting, which leads to rapid death of vegetative mass and yield reduction.
Mentioned in descriptions 16 384 varieties reference book.
Downy mildew is a group of diseases caused by specialized oomycetes. The disease manifests as the appearance of yellowish or brown angular spots on the upper side of the leaves, delimited by veins. On the underside of the leaf, under humid conditions, a characteristic grey-violet, white, or bluish fuzzy growth forms. Pathogen development leads to yellowing and drying of leaves, stunting of plants, and deformation of fruits, which, in the case of high pathogen aggressiveness, can lead to crop death in a short period.
Disease development depends directly on meteorological conditions and agronomic practices. The pathogen prefers a cool, humid environment, with critical risk factors being heavy dew, fog, prolonged rain, high air humidity, and crop density. Optimal conditions for infection include nighttime temperatures in the range of +13…+20°C and the presence of droplet moisture on the leaf surface for more than 6 hours.
Assessment of variety resistance during variety testing is based on phytopathological recording of the degree of leaf damage, specialized screening of collection samples, and molecular analysis methods using DNA markers to find genetic donors of resistance. In production, a distinction is made between genetically resistant varieties possessing specific Dm-genes and tolerant forms capable of maintaining yield under infection due to active vegetative mass formation. Since new pathogen races can overcome genetic resistance, varieties require regular monitoring and renewal.
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.
Valerianella locusta (L.) Laterr. · Corn salad
Service Officiel de Controle (FR)
Pisum sativum L. · Pea
SLUIS & GROOT BV (NL)
Lactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
Helianthus annuus L. · Sunflower
Kovalov Volodymyr Hryhorovych, Zaitsev Oleksii Borysovych,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Pisum sativum L. · Pea
Royal Sluis Vegetables BV (NL)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Hordeum vulgare L. · Barley
Dem"ianenko Alla Ivanivna, Vasylenko Nadiia Vasylivna, Morhun Volodymyr Vasylovych, Shubenko Nadiia Petrivna,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Cucumis sativus L. · Cucumber
Serhiienko Oksana Volodymyrivna, Diachenko Nina Mykolaivna, Pozniak Oleksandr Vasylovych, Shevchenko Olena IUriivna, Ptukha Nadiia Ivanivna,
Spinacia oleracea L. · Spinach
SPERLING| Carl Sperling & Co. (GmbH & Co. KG)
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vicia faba L. · Broad bean
SEMILLAS BATLLE
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis L. · Grapevine
Agroscope (CH)/Institut National de la Recherche Agronomique (FR)
Helianthus annuus L. · Sunflower
Skakunenko, Vladyslava
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Helianthus annuus L. · Sunflower
Jose Carlos Ramos Aguilar
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Helianthus annuus L. · Sunflower
Syngenta Crop Protection AG, CH
Vitis vinifera L. · Common grape vine
INCONNU (FR)