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.
Helianthus annuus L. · Sunflower
Euralis Semences FR
Pisum sativum L. · Pea
Hodowla Roslin Smolice Sp.z o.o Grupa IHAR
Helianthus annuus L. · Sunflower
LIMAGRAIN EUROPE S.A.
Helianthus annuus L. · Sunflower
Joel Meunier
Helianthus annuus L. · Sunflower
SEMILLAS CARGILL, S.A.
Helianthus annuus L. · Sunflower
Nickerson SA (FR)
Helianthus annuus L. · Sunflower
LIMAGRAIN EUROPE S.A.
Helianthus annuus L. · Sunflower
LIDEA FRANCE SAS
Helianthus annuus L. · Sunflower
Elena Andreea Teodorescu
Helianthus annuus L. · Sunflower
Euralis Semences FR
Sorghum bicolor (L.) Moench · Sorghum
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
Petran Alexandru-Viorel
Glycine max (L.) Merr. · Soybean
Saatzucht Donau GmbH & Co.KG
Helianthus annuus L. · Sunflower
PANAM FRANCE SARL
Lactuca sativa L. · Lettuce
Syngenta Seeds B.V.
Lactuca sativa L. · Lettuce
Syngenta Seeds B.V.
Pisum sativum L. · Pea
ZKI, H
Helianthus annuus L. · Sunflower
Kucheryava Olena Ivanivna, Hyske Ivan Mykolayovich, Buchuchanu Mikhail Ivanovich,
Lactuca sativa L. · Lettuce
Seminis Vegetable Seeds
Pisum sativum L. · Pea
Van Waveren Saaten GmbH
Helianthus annuus L. · Sunflower
Helianthus annuus L. · Sunflower
Surovikin Volodymyr Mykolaiovych, Pihrova Svitlana Kuz`mivna, Detsina Oleksandr Oleksandrovych, Ilatovs`kyi Volodymyr Platonovych, Borodin Serhii Heorhiiovych,
Pisum sativum L. · Pea
KWS MOMONT RECHERCHE SARL, FR
Helianthus annuus L. · Sunflower
GORBAChENKO FEDOR IVANOVICh / USATENKO TAT'YaNA VASIL'EVNA / KOSTRYBA MAJYa IOSIFOVNA / MARTYNOVA LYuDMILA ALEKSANDROVNA / MEZINOVA VALENTINA VASIL'EVNA / VOSKOBOJNIK LEONID KONSTANTINOVICh