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.
Castanea sativa Mill. · Sweet chestnut
PEDRO URQUIJO LANDALUCE
Castanea sativa Mill. · Sweet chestnut
PEDRO URQUIJO LANDALUCE
Solanum tuberosum L. · Potato
Olsztyńska Hodowla Ziemniaka i Nasiennictwo OLZNAS-CN sp. z o.o.
Solanum lycopersicum L. · Tomato
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Castanea sativa Mill. · Sweet chestnut
PEDRO URQUIJO LANDALUCE
Solanum tuberosum L. · Potato
Pelevyna Nadiia Semenivna, Odynokyi Andrii Volodymyrovych, Odynoka Raisa Mykolaivna, Kononuchenko Valerii Vasyl`ovych, Osypchuk Andrii Antonovych, Odynokyi Mykola Semenovych,
Solanum lycopersicum L. · Tomato
Maren Shutte, Ad Barten,
Citrus limettioides Tanaka · Indian sweet lime
INCONNU (FR)
Solanum tuberosum L. · Potato
INCONNU (FR)
Solanum lycopersicum L. · Tomato
Kovbasenko Raisa Vasylivna, Kovbasenko Kateryna Opanasivna, Kovbasenko Vasyl` Mykhailovych, Hubar Mykola Ivanovych, Horkutsenko Oleksandr Vasyl`ovych,
Solanum lycopersicum L. · Tomato
HM Clause SA (FR)
Solanum tuberosum L. · Potato
INCONNU (FR)
Solanum lycopersicum L. · Tomato
Korets`ka Olena Oleksandrivna, Kovbasenko Raisa Vasylivna, Kovbasenko Kateryna Opanasivna, Kovbasenko Vasyl` Mykhailovych, Hubar Mykola Ivanovych, Horkutsenko Oleksandr Vasyl`ovych,
Solanum tuberosum L. · Potato
Koval` Nataliia Demianivna, Serhiienko Viktoriia Mykhailivna, Zhyhailo Iosyp Ivanovych, Nazar Stefaniia Hryhorivna, Tereschenko Oleksandr Ivanovych, Osypchuk Andrii Antonovych, Sheremet Nina Illarionivna,
Solanum tuberosum L. · Potato
Instytut Ziemniaka
Capsicum annuum L. · Bell pepper
Vilmorin SA (FR)
Rubus idaeus L. · Red raspberry
Niwa Hodowla Roślin Jagodowych sp. z o.o.
Solanum tuberosum L. · Potato
Stacja Hodowli Roślin Żelazna
Solanum lycopersicum L. · Tomato
Panchev IUrii Ivanovych
Solanum lycopersicum L. · Tomato
Sylvain Bontems
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
Oliinyk Tetiana Mykolaivna, Borivs`kyi Anatolii Frantsovych, Furdyha Mykola Mykolaiovych, Abdurahimova Tamara Volodymyrivna, Borzykh Oleksandr Ivanovych, Hunchak Volodymyr Mykhailovych, Tymko Mykola Hryhorovych, Bondarchuk Anatolii Andriiovych, Sydorchuk
Solanum lycopersicum L. · Tomato
Kees Konst
Solanum lycopersicum L. · Tomato
Shkl`oda Natalia Stepanivna, Diachenko Liudmyla Ivanivna, Tolinova Tetiana Oleksiivna, Lysak Nataliia Serhiivna, Pylypenko Liubov Vasylivna, Krutko Roman Vasylovych,