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 lycopersicum L. · Tomato
Centre Tech. de Conservation des produits Agricoles (FR)/Institut National de la Recherche Agronomique (FR)
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
Saka Pflanzenzucht GmbH Co KG
Solanum tuberosum L. · Potato
SIPRE (FR)
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Medicago sativa L. · Alfalfa
SPRINGBROOK NOMINEES P/L
Solanum tuberosum L. · Potato
BAVARIA| Bavaria Saat BGB Ges.mbH
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Solanum tuberosum L. · Potato
HERMEZIU RADU
Solanum tuberosum L. · Potato
István Sárvári
Solanum tuberosum L. · Potato
HERMEZIU RADU
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
OSIPChUK ANDREJ ANTONOVICh / NAZAR STEFANIYa GRIGOR'EVNA / GRITSENKO EKATERINA PETROVNA / KUChKO ANATOLIJ ANDREEVICh / OSIPChUK ALLA ANDREEVNA / TIMOShENKO TAT'YaNA VASIL'EVNA / TARASENKO OLEG ALEKSANDROVICh / TAKTAEV BORIS ANATOL'EVICh / TARAShchENKO NAD
Solanum tuberosum L. · Potato
CRAW-DPT SCIENCES DU VIVANT - UNITÉ D'AMÉLIORATION
Solanum tuberosum L. · Potato
Jaan Sarv 90%, Kaljo Kask 10%
Prunus domestica L. subsp. insititia (L.) C. K. Schneid. · Damson
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Solanum tuberosum L. · Potato
Sloots Aardappelkweekbedrijf B.V.
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum lycopersicum L. · Tomato
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Solanum tuberosum L. · Potato
BRETAGNE PLANTS INNOVATION S.A.S.
Glycine max (L.) Merr. · Soybean
Sevita Genetics
Solanum tuberosum L. · Potato
IPR B.V.
Solanum lycopersicum L. · Tomato
Pro-Veg Seeds Ltd. Unit N Peek House, Dales Manor Business Park