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
SOLTAU - BERGEN SAATZUCHT E.G.
Solanum tuberosum L. · Potato
ZPC
Capsicum annuum L. · Bell pepper
SOUTHERN SEED S.R.L.
Capsicum annuum L. · Bell pepper
HM.CLAUSE
Solanum lycopersicum L. · Tomato
Petr Klapste
Solanum tuberosum L. · Potato
Selekta Pacov, a.s., CZ
Solanum tuberosum L. · Potato
Z.P.C. /G. VAN DER ZEE /P. VAN DER ZEE
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum lycopersicum L. · Tomato
Superior, Velika Plana
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Ger Beemsterboer
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Simpson David
Solanum tuberosum L. · Potato
Vesa Velhartice a.s., CZ
Solanum lycopersicum L. · Tomato
UO «BELORUSSKAYA GOSUDARSTVENNAYA ORDENOV OKTYABRSKOJ REVOLYUCII I TRUDOVOGO KRASNOGO ZNAMENI SELSKOXOZYAJSTVENNAYA AKADEMIYA»
Medicago sativa L. · Alfalfa
S&W SEED COMPANY
Glycine max (L.) Merr. · Soybean
Stine Seed Company
Solanum tuberosum L. · Potato
Zella J. Doig
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Glycine max (L.) Merr. · Soybean
Stine Harry
Glycine max (L.) Merr. · Soybean
Semences Prograin Inc
Solanum tuberosum L. · Potato
Sloots Solanum BV (NL)
Solanum tuberosum L. · Potato
Lantmõnnen Seed B.V.
Solanum tuberosum L. · Potato
SCHROEDER JOACHIM| Joachim Schroeder
Solanum tuberosum L. · Potato
Piet H.Smeenge