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
SAKA-RAGIS PFLANZENZUCHT GBR
Solanum tuberosum L. · Potato
Cooeperatie Agrico U.A.
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Solanum lycopersicum L. · Tomato
Bejo Zaden B.V.
Glycine max (L.) Merr. · Soybean
Sylvain Legay
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum melongena L. · Eggplant
UNITED GENETICS SEEDS CO
Medicago sativa L. · Alfalfa
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Medicago sativa L. · Alfalfa
Plant Breeding International Cambridge Ltd (GB)
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel
Solanum tuberosum L. · Potato
Stet Holland BV (NL)
Solanum tuberosum L. · Potato
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum tuberosum L. · Potato
SAKA-RAGIS PFLANZENZUCHT GBR
Solanum tuberosum L. · Potato
SCICA BRETAGNE- PLANTS
Solanum tuberosum L. · Potato
Vandel Potatoes I/S c/o Danespo A/S
Solanum lycopersicum L. · Tomato
UO «BELORUSSKAYA GOSUDARSTVENNAYA ORDENOV OKTYABRSKOJ REVOLYUCII I TRUDOVOGO KRASNOGO ZNAMENI SELSKOXOZYAJSTVENNAYA AKADEMIYA» GNU «INSTITUT GENETIKI I CZITOLOGII NAN BELARUSI»
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
Aardappelkweek- en Selectiebedrijf Ijsselmeerpolders B.V.
Solanum tuberosum L. · Potato
Station de Recherche du ComitÚ Nord
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
SAKA PFLANZENZUCHT GMBH AND CO KG
Solanum tuberosum L. · Potato
Heinrich Böhm