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.
Vaccinium corymbosum L. · Highbush blueberry
Gospodarstwo Ogrodnicze Jerzy Wilczewski
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum tuberosum L. · Potato
Onyshcenko Oleh Fedorovych, Haistruk Hennadii Viktorovych, Shkurko Ihor Viktorovych, Petrenko Kateryna Oleksandrivna, Drobnokhod Oleksii Vasylovych,
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Bernardini Danilo
Glycine max (L.) Merr. · Soybean
Istvan Rajcan
Solanum tuberosum L. · Potato
INCONNU (FR)
Gerbera jamesonii Bolus ex Hook. f. · Barberton daisy
Florist De Kwakel B.V. Gerbera Kulturen
Solanum lycopersicum L. · Tomato
Uniseeds Select B.V.
Solanum tuberosum L. · Potato
Ravlyk Dmytro Vasyl`ovych
Solanum tuberosum L. · Potato
INCONNU (FR)
Solanum tuberosum L. · Potato
VOGEL JOSEF| Dr. Josef Vogel
Solanum tuberosum L. · Potato
Osypchuk, Alla Cherednichenko, Liubov Furdyha, Mykola Tomash, Anatolii Kupriianova, Tetiana Taktaiev, Borys Borzykh, Oleksandr Zakharchuk, Nataliia Bondarchuk, Anatolii
Solanum lycopersicum L. · Tomato
BURPEE NL B.V.
Solanum tuberosum L. · Potato
Lietuvos agrarinių ir miškų mokslų centro Vokės filialas
Malus Mill. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
SCOTTISH CROP RESEARCH INSTITUTE
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
MIKE LUIZA
Solanum tuberosum L. · Potato
Hodowla Roślin w Jezierzycach k/Słupska sp. z o.o.
Malus Mill. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Rubus idaeus L. · Red raspberry
Niwa Hodowla Roślin Jagodowych sp. z o.o.
Castanea sativa Mill. · Sweet chestnut
JUNTA DE GALICIA (CIFA)
Solanum tuberosum L. · Potato
Instytut kartopliarstva Natsionalnoi akademii ahrarnykh nauk Ukrainy
Solanum lycopersicum L. · Tomato
Mercier Jean-Claude