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.
Vitis L. · Grapevine
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Helianthus annuus L. · Sunflower
Martin Gansmann
Spinacia oleracea L. · Spinach
KWS VEGETABLES B.V.
Lactuca sativa L. · Lettuce
CW. PANNEVIS BV (NL)
Helianthus annuus L. · Sunflower
LIMAGRAIN VERNEUIL HOLDING S.A.
Helianthus annuus L. · Sunflower
LIMAGRAIN GENETICS GRANDES CULTURES S.A.
Vitis vinifera L. · Common grape vine
Oliinykov Mykolai Petrovych, Klymenko Viktor Pavlovych, Melkonian Misak Vaharshakovych, Volynkin Volodymyr Oleksandrovych,
Vitis vinifera L. · Common grape vine
Mincho Kondarev, Dimitar Prodanski, Ivanka Boneva, Stoyan Kukunov, Penka Georgieva, Stoyanka Krastanova
Helianthus annuus L. · Sunflower
Shapovalova Liubov Hennadiivna, Honcharov Serhii Volodymyrovych, Holovin Anatolii Vasyl`ovych, Bochkar`ov Mykola Ivanovych, Sliusar Emiliia L`vivna, Hrydniev Oleksii Kuz`mich, Sharyhina Mariana L`vivna, Savchenko Valentyna Dem'ianivna, Bochkovoi Anatolii
Lactuca sativa L. var. capitata L. · Head lettuce
HORTAG SEED CO.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. · Lettuce
HAZERA (1939)
Lactuca sativa L. · Lettuce
RIJK ZWAAN Z.Z. B.V.
Helianthus annuus L. · Sunflower
Malinovskyi Serhii Volodymyrovych
Helianthus annuus L. · Sunflower
Koval`ov Volodymyr Hryhorovych, Zaitsev Oleksii Borysovych,
Cucumis sativus L. · Cucumber
Khokhlova Nataliia Oleksiivna, Ivanova Anna Pavlivna, Suchkova Liubov Vasylivna,
Poa pratensis L. · Kentucky bluegrass
Lietuvos agrarinių ir miškų mokslų centro filialas Žemdirbystės institutas
Vitis vinifera L. · Common grape vine
Mincho G. Kondarev
Vitis vinifera L. · Common grape vine
Shein Tamara Volodymyrivna, Dylyk Antonina Petrivna, Storozhuk Kateryna Moisiivna, Tarakhtii Liudmyla Ivanivna, Chebanenko IEvheniia Pavlivna, Meleshko Larysa Fedorivna, Dokuchaieva IEvheniia Mykolaivna,
Helianthus annuus L. · Sunflower
KARPENKO OLEKSANDR, LUKIANCHYK IURII
Lactuca sativa L. var. crispa L. · Leaf lettuce
RIJK ZWAAN Zaadteelt en Zaadhandel B.V.
Helianthus annuus L. · Sunflower
Martin Gansmann
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Cucumis sativus L. · Cucumber
Shamshyna Anna Viacheslavovna, Portiankin Alieksei Evhenovych, Havrysh Serhii Fedorovych,