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
KWS SAAT SE&CO.KGaA, DE
Spinacia oleracea L. · Spinach
Pop Vriend Seeds B.V. (NL)
Helianthus annuus L. · Sunflower
Nicolae Boaghe, Elena Andreea Teodorescu
Helianthus annuus L. · Sunflower
UPL FRANCE
Helianthus annuus L. · Sunflower
UPL FRANCE
Helianthus annuus L. · Sunflower
Euralis Semences
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Cucumis sativus L. · Cucumber
PRZEDSIEBIORSTWO NASIENNICTWA OGRODNICZEGO I SZKOLKARSTWA
Cucumis sativus L. · Cucumber
Zoldesegtermesztesi Kutato Intezet RT (HU)
Helianthus annuus L. · Sunflower
KWS Saat AG, DE
Glycine max (L.) Merr. · Soybean
Santiago Fleming
Helianthus annuus L. · Sunflower
Euralis Semences
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Remi Leviel
Cucumis sativus L. · Cucumber
MORAVOSEED
Pisum sativum L. · Pea
Syngenta Seeds B.V.
Cucumis sativus L. · Cucumber
MORAVOSEED
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Lactuca sativa L. · Lettuce
Enza Zaden B.V.
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Lactuca sativa L. · Lettuce
S&G SEEDS B.V.
Helianthus annuus L. · Sunflower
Pierre GARRAUD
Pisum sativum L. · Pea
Danko Hodowla Roslin Sp.z.o.o.
Helianthus annuus L. · Sunflower
Steve Thompson
Helianthus annuus L. · Sunflower
Prograin Genetique (FR)