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
ShANINA ELENA PETROVNA / KLYuKINA ELIZAVETA MATVEEVNA / ChUENKO ALEKSANDR MIHAJLOVICh / BANADYSEV SERGEJ ALEKSANDROVICh
Solanum tuberosum L. · Potato
Bavaria Saat GbR
Solanum tuberosum L. · Potato
Sativa Keřkov a.s., CZ
Solanum tuberosum L. · Potato
HZPC Holland B.V.
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Kmetijski Inštitut Slovenije (Agricultural Institute of Slovenia)
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond
Solanum tuberosum L. · Potato
VANDEL POTATOES I/S
Solanum tuberosum L. · Potato
BRETAGNE PLANTS INNOVATION S.A.S.
Solanum lycopersicum L. · Tomato
Instytut Warzywnictwa im. Emila Chroboczka \Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa Spółka Akcyjna w upadłości likwidacyjnej \Polska Hodowla i Nasiennictwo Roślin Ogrodniczych IWARZ-PNOS sp. z o.o.
Solanum lycopersicum L. · Tomato
Agri Obtentions SA (FR)/Institut National de la Recherche Agronomique (FR)
Taxus baccata L. · European yew
Josa Selecties BV
Trifolium subterraneum L. · Subterranean clover
NEW SOUTH WALES, DEP.AGR.
Solanum lycopersicum L. · Tomato
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Solanum tuberosum L. · Potato
Semences Innovation Protection Recherche et Environnement (SIPRE) S.A.R.L. Unipersonnelle
Solanum tuberosum L. · Potato
APP Agroresursu un ekonomikas institūts
Trifolium subterraneum L. · Subterranean clover
WESTERN AUSTRALIA,DEP.AGR
Solanum lycopersicum L. · Tomato
Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.
Solanum tuberosum L. · Potato
KWEEKINSTITUUT KARNA
Capsicum annuum L. · Bell pepper
UNITED GENETICS SEEDS CO
Solanum tuberosum L. · Potato
325. Mrs. Maura Kehoe
Solanum lycopersicum L. · Tomato
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Taxus baccata L. · European yew
Josa Selecties BV
Solanum lycopersicum L. · Tomato
HAO-DEMETER Vine, Fruit Trees and Vegetable Research Institute