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
Spijkman, Jan Lucas / Spijkman-Vergeer, Johanna Maria
Solanum tuberosum L. · Potato
ROCUS PIETER GRAVELAND
Solanum tuberosum L. · Potato
Gisele Lary Joly
Solanum tuberosum L. · Potato
Lairy - Joly Gise'le
Solanum tuberosum L. · Potato
HESELMANS GUUS
Persea americana Mill. · Avocado
Kohne Josef Stefan|Duivelskloof, ZA 0835
Solanum tuberosum L. · Potato
Prof.Dr.sc. Christfried Pfeffer / Dr. Paul Steinbach
Solanum tuberosum L. · Potato
STOL L.D. (US)
Solanum tuberosum L. · Potato
STAShEVSKI ZENON / ZAMALIEVA FANIYa FAJZRAHMANOVNA / GIMAEVA ELENA ALEKSEEVNA / VOLOGIN SEMEN GERMANOVICh / SALIHOVA ZIFA ZAKAR'EVNA / GIZATULLINA AL'BINA TALGATOVNA / NAZMIEVA REZIDA RYaZAKOVNA / SAFIULLINA GUL'GENA FLYuNOVNA / KUZ'MINOVA OL'GA ANDREEVNA
Solanum tuberosum L. · Potato
ZAMALIEVA FANIYa FAJZRAHMANOVNA / GIMAEVA ELENA ALEKSEEVNA / VOLOGIN SEMEN GERMANOVICh / SALIHOVA ZIFA ZAKAR'EVNA / GIZATULLINA AL'BINA TALGATOVNA / NAZMIEVA REZIDA RYaZAKOVNA / SAFIULLINA GUL'GENA FLYuNOVNA / KUZ'MINOVA OL'GA ANDREEVNA / SKLYaROVA NADEZh
Solanum tuberosum L. · Potato
JANSEN A.
Solanum tuberosum L. · Potato
WOLF & WOLF BV (NL)
Solanum tuberosum L. · Potato
Hettema Zonen Kweekbedrijf B.V.
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
PLANT RESEARCH| Plant Research International B.V.
Solanum tuberosum L. · Potato
WOLF EN WOLF BV
Solanum tuberosum L. · Potato
VEREDELINGSBEDRIJF D.B
Solanum tuberosum L. · Potato
O.A.BRAAK
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
ZIMMERMANN WILLI| Willi Zimmermann
Solanum tuberosum L. · Potato
MARIEN WINTERS_ / J. J. H. M. ALLEFS_ / J. J. VAN HOOGEN_
Solanum tuberosum L. · Potato
Heinrich BOHM, DE
Solanum tuberosum L. · Potato
Jacob Eising
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre