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
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum lycopersicum L. · Tomato
Kuz`omens`kyi Oleksandr Volodymyrovych
Solanum tuberosum L. · Potato
Y.P. van der Werff/ZPC
Solanum tuberosum L. · Potato
Saatzucht Rudolf Pohl K.G.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum lycopersicum L. · Tomato
Clause Semences SA (FR)
Solanum lycopersicum L. · Tomato
Namdhari Seeds PVT Ltd. Sri Sai Arcade No. 8, 12th Cross, 1st Phase
Solanum tuberosum L. · Potato
Fobek B.V., Broer A.J. Siderius, Potato Masters Picardie S.A.S., Tuberosum Technologies Inc.
Solanum tuberosum L. · Potato
Kartoffelzucht Böhm GmbH & Co. KG
Solanum tuberosum L. · Potato
Olsztyńska Hodowla Ziemniaka i Nasiennictwo OLZNAS-CN sp. z o.o.
Rubus idaeus L. · Red raspberry
Washington State University Research Foundation (US)
Solanum tuberosum L. · Potato
HZPC Holland BV (NL)
Glycine max (L.) Merr. · Soybean
Semican INC (CA)
Solanum tuberosum L. · Potato
SAS Bernard
Solanum tuberosum L. · Potato
Institut für Kartoffelforschung Herrn Horst Beyer / Hans-Georg Zschüttig im Institut für Kartoffelforschung
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
University of Pannonia,Potato Research Centre (HU)
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
SAKA| SaKa Pflanzenzucht GmbH & Co. KG
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Solanum tuberosum L. · Potato
Saatbau Linz OÖ. Landes-Saatbaugen.reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
Norika Nordring-Kartoffelzucht und Vermehrungs GmbH (DE)/Sativa Keřkov, a.s. (CZ)
Solanum tuberosum L. · Potato
Domaine Public (FR)