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
MAS SEEDS
Helianthus annuus L. · Sunflower
Filip Zhiuv
Helianthus annuus L. · Sunflower
SINISA JOCIC / SANDRA CVEJIC / GORAN MALIDZA / DRAGANA MILADINOVIC / VLADIMIR MIKLIC / NENAD DUSANIC
Sinapis alba L. · White mustard
KUZNETSOVA GALINA NIKOLAEVNA / POLYaKOVA RAISA SERGEEVNA / LOShKOMOJNIKOV IVAN ANATOL'EVICh / GORLOVA LYuDMILA ANATOL'EVNA / TRUBINA VIKTORIYa SERGEEVNA
Helianthus annuus L. · Sunflower
Rustica Prograin Genetique SA (FR)/Institut National de la Recherche Agronomique (FR)
Helianthus annuus L. · Sunflower
LIMAGRAIN VERNEUIL HOLDING S.A.
Brassica oleracea L. (Broccoli Group) · Broccoli
SSC JP
Allium fistulosum L. · Welsh onion
Her Bimsdeboer
Brassica oleracea L. (Cauliflower Group) · Cauliflower
SEMINIS VEGETABLE SEEDS, NL
Brassica oleracea L. (Broccoli Group) · Broccoli
Bejo Zaden BV (NL)
Pisum sativum L. · Pea
SEMINIS VEGETABLE| Seminis Vegetable Seeds Deutschland GmbH
Pisum sativum L. · Pea
Van Waveren Saaten GmbH
Cucumis sativus L. · Cucumber
Syngenta Seeds, NL
Lactuca sativa L. · Lettuce
Syngenta Seeds, NL
Pisum sativum L. · Pea
Zoldesegtermesztesi Kutato Intezet RT (HU)
Pisum sativum L. · Pea
Syngenta Seeds, NL
Daucus carota L. · Carrot
Robert Priieur
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
Euralis Semences, Mondoville (FR)
Helianthus annuus L. · Sunflower
SYNGENTA SEEDS AG, CH
Beta vulgaris Garden Beet Group · Garden beet
Syngenta Seeds B.V.
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Glycine max (L.) Merr. · Soybean
Saatzucht Donau GmbH & Co.KG
Cucumis sativus L. · Cucumber
HM.CLAUSE