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
Vitis vinifera L. · Common grape vine
Roshka Nataliia Anatoliivna, Oliinykov Mykolai Petrovych, Melkonian Misak Vaharshakovych, Klymenko Viktor Pavlovych, Volynkin Volodymyr Oleksandrovych,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Cucumis sativus L. · Cucumber
Hans Briuer
Vitis vinifera L. · Common grape vine
Prof. Dr. Pal Kozma Lehrstuhl f. Wein- u. Gartenbau Universität Budapest
Helianthus annuus L. · Sunflower
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Helianthus annuus L. · Sunflower
Avramenko Oleksandr Oleksandrovych , Scherban` Nataliia Fedorivna, Scherban` Serhii Vasyl`ovych,
Vitis vinifera L. · Common grape vine
Dashkevych Anatolii Vladyslavovych, Yefremov Vasyl` Oleksiiovych, Shein Tamara Volodymyrivna, Tarakhtii Liudmyla Ivanivna, Meleshko Larysa Fedorivna, Sambors`ka Hanna Kyrylivna, Tulaieva Maiia Ivanivna, Dokuchaieva IEvheniia Mykolaivna,
Cucumis melo L. · Melon
Larry Hollar, Xuemei Zhang,
Vitis vinifera L. · Common grape vine
INCONNU (FR)
Vitis vinifera L. · Common grape vine
LAND BAYERN WUERZBURG| Land Bayern, vertreten durch Bayerische Landesanstalt fuer Weinbau und Gartenbau - Abt. Weinbau und Oenologie -
Spinacia oleracea L. · Spinach
Maraldi Seeds Denmark
Vitis vinifera L. · Common grape vine
ESTACION EXPERIMENTAL AGROPECUARIA INTA RAMA CAIDA (AR)
Cucumis sativus L. · Cucumber
Henrikh IUst
Vitis vinifera L. · Common grape vine
Meleshko Larysa Fedorivna, Sambors`ka Hanna Kyrylivna, Abliazova Aia Pavlivna, Tulaieva Maiia Ivanivna, Dokuchaieva IEvheniia Mykolaivna, Aivazian Petros Karapetovych,
Cucumis sativus L. · Cucumber
Shevkunov Valerii Mykolaiovych, Prutens`ka Nataliia Oleksiivna, Shamshyna Anna Viacheslavovna, Portiankin Alieksiei IEvhenovych, Havrysh Serhii Fedorovych,
Lactuca sativa L. · Lettuce
Yuksel Seeds B.V.
Glycine max (L.) Merr. · Soybean
Kolot Valentyna Vasylivna, Kolot Viktor Mykolaiovych, Drobit`ko Mykola Oleksiiovych, Obertiuk IUrii Volodymyrovych, Temchenko Inna Viktorivna, Ivaniuk Serhii Vasyl`ovych, Petrychenko Vasyl Florovych, Babych Anatolii Oleksandrovych,
Vitis vinifera L. · Common grape vine
LAND HESSEN GEISENHEIM| Land Hessen, vertreten durch FA f. Wein- und Gartenbau, Ge- traenketechnologie u.Landespflege-Fachgb. f.Rebenzuech.u.-veredl.-
Vitis vinifera L. · Common grape vine
INCONNU (FR)
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
Antoine Mezzarobba
Vitis vinifera L. · Common grape vine
Dr. Norbert Becker im Staatl. Weinbauinstitut