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.
Hybrids between Citrus x aurantium L. x Citrus trifoliata L.
IVIA
Solanum tuberosum L. · Potato
Hodowla Roślin w Jezierzycach k/Słupska sp. z o.o.
Solanum tuberosum L. · Potato
INCONNU (FR)
Solanum tuberosum L. · Potato
Siharova Dina Dmytrivna, Zelia Avreliia Heorhiivna, Il`chuk Vasyl` Arkhypovych, Il`chuk Roman Vasyl`ovych, Il`chuk Lidiia Andriivna,
Malus pumila L. Mill. · Paradise apple
EAST MALLING RESEARCH ST. (GB)
Solanum tuberosum L. · Potato
Pylypenko Liliia Aminovna, Razkevych Mykola Pylypovych, Svertoka Viktor IEvmenovych, Myts`ko Volodymyr Mykolaiovych, Zholudenko Oksana Vladyslavivna, Tymoshenko Tetiana Vasylivna, Tarasenko Oleh Oleksandrovych, Taktaiev Borys Anatoliiovych, Osypchuk Alla
Solanum tuberosum L. · Potato
Hodowla Roślin sp. z o.o. w Scholastykowie
Nicotiana tabacum L. · Tobacco
Ruska G. Peeva, Boyan I. Bakalov
Solanum tuberosum L. · Potato
Germicopa Breeding (FR)
Solanum tuberosum L. · Potato
Pryvatne aktsionerne tovarystvo naukovo-vyrobnyche ob’iednannia «Chernihivelitkartoplia»
Nicotiana tabacum L. · Tobacco
G. Stankev, H. Bozukov
Solanum tuberosum L. · Potato
BOZESAN ION
Malus pumila L. Mill. · Paradise apple
INCONNU (FR)
Solanum lycopersicum L. · Tomato
HEBREW UNI/HAZERA
Solanum tuberosum L. · Potato
Vermenko IUrii IAkovych, Taraschenko Nadiia Ivanivna, Tarasenko Oleh Oleksandrovych, Voitseshyna Nataliia Ivanivna, Mel`nyk Pavlo Oleksiiovych, Razkevych Mykola Pylypovych, Kononuchenko Valerii Vasyl`ovych, Taktaiev Borys Anatoliiovych, Osypchuk Alla Andr
Thuja occidentalis L. · Northern white-cedar
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Rhododendron simsii Planch. · Indica azalea
Eleonore Dettmer und Peter Dettmer (als Gesellschaft des bürgerlichen Rechts)
Castanea sativa Mill. · Sweet chestnut
PEDRO URQUIJO LANDALUCE
Castanea sativa Mill. · Sweet chestnut
PEDRO URQUIJO LANDALUCE
Solanum lycopersicum L. · Tomato
FLORANOVA LTD
Solanum tuberosum L. · Potato
INCONNU (FR)
Castanea sativa Mill. · Sweet chestnut
PEDRO URQUIJO LANDALUCE
Solanum tuberosum L. · Potato
J.G.KONST
Solanum tuberosum L. · Potato
AGRIC.CANADA