Red Alert
TerminatedSolanum lycopersicum L. · Tomato
Diseases
Late blight
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.
Breakdown by crop
Potato late blight
1 396
Tomato Late Blight
273
Phytophthora root rot of strawberry
99
Phytophthora Root and Stem Rot of Soybean
61
Phytophthora Root Rot of Alfalfa
41
Phytophthora blight of pepper
41
Apple Phytophthora Rot
24
Phytophthora Root Rot of Raspberry
21
Apple Phytophthora Rot
20
Tomato Late Blight
17
Citrus Phytophthora
17
Plum Phytophthora root rot
15
Phytophthora blight — hybrids between Citrus x aurantium L. x Citrus trifoliata L.
13
Strawberry Phytophthora root rot
13
Phytophthora Root Rot of Blueberry
11
Phytophthora root rot of sweet chestnut
9
Phytophthora blight — Leek
7
Phytophthora root rot of sour cherry
6
Phytophthora root rot of paradise apple
6
Avocado Phytophthora Root Rot
6
Peach Phytophthora Root Rot
5
Phytophthora root rot of Vaccinium
5
Late Blight of Eggplant
4
Phytophthora root rot of Prunus amygdalus x Prunus persica
4
Found in these crops
Varieties that feature this in their description
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.
NADA
TerminatedSolanum tuberosum L. · Potato
HR
1 record
LIKA
TerminatedSolanum tuberosum L. · Potato
HR
1 record
FANDANGO F1
TerminatedSolanum lycopersicum L. · Tomato
HR
1 record
P 12-2
Protection expiredNicotiana tabacum L. · Tobacco
HR
1 record
ISZ 13
TerminatedGlycine max (L.) Merr. · Soybean
HR
1 record
DOBRA
TerminatedSolanum tuberosum L. · Potato
HR
1 record
3309 Couderc
Protection expiredVitis berlandieri Planch x Vitis rupestris Scheele
SI
1 record
BISERKA
TerminatedSolanum tuberosum L. · Potato
HR
1 record
Siikli
ActiveSolanum tuberosum L. · Potato
VIKTORIA
Protection expiredSolanum tuberosum L. · Potato
HR
1 record
PYROS F1
TerminatedSolanum lycopersicum L. · Tomato
HR
1 record
Monprecos
ActiveSolanum lycopersicum L. · Tomato
Rode Eersteling
ActiveSolanum tuberosum L. · Potato
Cardinal
TerminatedSolanum lycopersicum L. · Tomato
Mikado
TerminatedSolanum lycopersicum L. · Tomato
Doré
ActiveSolanum tuberosum L. · Potato