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
R.P.GRAVELAND
Solanum tuberosum L. · Potato
Solana, D
Solanum tuberosum L. · Potato
Sjefke Allefs
Solanum tuberosum L. · Potato
Mr. G. Kuper
Solanum tuberosum L. · Potato
VEREINIGTE BOERDE| Vereinigte Boerde-Altmark- Saaten Magdeburg GmbH / BIERMA H.I.| H.I. Bierma
Solanum tuberosum L. · Potato
SCHUCHMANN| Dr. Walter Schuchmann / BOEHM GEORG| Georg Boehm
Solanum tuberosum L. · Potato
MANSHOLT'S VEREDELINGS-BEDRIJF BV (NL)
Solanum tuberosum L. · Potato
LANDBRUGETS| Landbrugets Kartoffelfond, LKF
Solanum tuberosum L. · Potato
Wageningen UR Plant Breeding
Solanum tuberosum L. · Potato
Wolfgang Walter
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
SOCIETE CIVILE DARBONNE
Solanum tuberosum L. · Potato
Andi John Gordon Gibson
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
GW te Winkel
Solanum tuberosum L. · Potato
HETTEMA ZONEN B.V
Solanum tuberosum L. · Potato
J.P.M.Muijsers
Solanum tuberosum L. · Potato
SOLANA GMBH & CO KG
Solanum tuberosum L. · Potato
GERMICOPA SAS
Solanum tuberosum L. · Potato
Wolfgang Walter, Norika Nordring - Kartoffelzucht - und Vermehrungs - GmbH Gross Lusewitz
Solanum tuberosum L. · Potato
MARIEN WINTERS
Solanum tuberosum L. · Potato
Justus Bohm
Solanum tuberosum L. · Potato
Teagasc Oak Park Research Centre
Solanum tuberosum L. · Potato
Meijer C. BV (NL)
Solanum tuberosum L. · Potato
Heinrich Böhm