Diseases
Phytophthora infestans
Late blight is a dangerous disease of solanaceous crops caused by an oomycete, which manifests as the appearance of spots on leaves, stems, and tubers. The development of the disease is triggered by high humidity and moderate temperatures, which can lead to significant crop losses.
Mentioned in descriptions 6 798 varieties reference book.
Affected plants develop dirty-brown spots, often accompanied by a whitish mold on the underside of the leaf, while elongated dark-brown spots appear on the stems. Tubers show hard, sunken brown spots, and the internal tissue exhibits a characteristic rust-brown discoloration upon cutting.
Epiphytotics develop under conditions of high air humidity around 90% and alternating warm days with cool nights. The presence of free moisture, such as dew or fog, is a critical factor for rapid spore germination, which allows the infection to spread across the field in 10–15 days.
In breeding, a distinction is made between specific vertical resistance, controlled by R-genes, and field horizontal resistance, which is considered more reliable due to its polygenic nature and ability to slow down pathogen development. Varieties are evaluated using a 9-point scale; however, the resistance level of the foliage does not always coincide with that of the tubers, requiring comprehensive analysis during variety testing.
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.
Solanum tuberosum L. · Potato
NORIKA Nordring-Kartoffelzucht-und Vermehrungs-GmbH Gross Luesewitz
Solanum tuberosum L. · Potato
Station de Recherche du ComitÚ Nord
Solanum tuberosum L. · Potato
Wolfgang Walter, NORIKA-Nordring-Kartoffelzucht- und Vermehrungs-GmbH Gross Luesewitz
Solanum tuberosum L. · Potato
Justus Böhm
Solanum tuberosum L. · Potato
Lantmõnnen Seed B.V.
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Gisele Lairy-Joly
Solanum lycopersicum L. · Tomato
Nunhnes B.V
Solanum tuberosum L. · Potato
Walter DeJong, Cornell University
Solanum tuberosum L. · Potato
Walter DeJong, Cornell University
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Meulenbroek Egbertus Joseph
Medicago sativa L. · Alfalfa
PLANT GENETICS
Solanum tuberosum L. · Potato
Kweek-en Researchbedrijf Agrico B.V., Netherlands
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico BV
Solanum tuberosum L. · Potato
Interseed Potatoes GmbH
Solanum tuberosum L. · Potato
Jack Dunnett, Caithness Potato Breeders Ltd
Solanum tuberosum L. · Potato
R.P.GRAVELAND
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum tuberosum L. · Potato
Europlant innovation GmbH & Co. KG, 21337 Luneburg
Solanum tuberosum L. · Potato
Solana, D
Solanum tuberosum L. · Potato
Justus Böhm