Blue Ace
ActiveMedicago sativa L. · Alfalfa
IT
4 records
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.
Blå Mandel
ActiveSolanum tuberosum L. · Potato
SE
3 records
Asker
ActiveRubus idaeus L. · Red raspberry
SE
5 records
Arran Consul
ActiveSolanum tuberosum L. · Potato
IE
3 records
Mira
ActiveFragaria x ananassa Duchesne ex Rozier · Garden strawberry
Venus
ActiveGlycine max (L.) Merr. · Soybean
IT
4 records
Tresor
ActiveCapsicum annuum L. · Bell pepper
NL
3 records
Calipso
ActiveGlycine max (L.) Merr. · Soybean
IT
3 records
Mirka
TerminatedSolanum tuberosum L. · Potato
NL
SK
2 records
Unibac
ActiveSolanum lycopersicum L. · Tomato
CZ
2 records
Nemador
TerminatedSolanum lycopersicum L. · Tomato
NL
2 records
Cal J
TerminatedSolanum lycopersicum L. · Tomato
ES
2 records
Appio
ActiveSolanum lycopersicum L. · Tomato
HU
2 records
Brda
TerminatedSolanum tuberosum L. · Potato
HR
PL
2 records
UG 812 J
TerminatedSolanum lycopersicum L. · Tomato
NL
2 records
Valmína
ActiveSolanum tuberosum L. · Potato
CZ
3 records
Rosaliya
TerminatedSolanum lycopersicum L. · Tomato
NL
2 records
Röd Mandel
ActiveSolanum tuberosum L. · Potato
SE
3 records
Motueka
ActiveSolanum tuberosum L. · Potato
CZ
3 records
Maximum
ActiveSolanum tuberosum L. · Potato
SE
3 records
Jindra
ActiveSolanum tuberosum L. · Potato
CZ
3 records
Emina
ActiveSolanum tuberosum L. · Potato
CZ
3 records
Vuokatin musta
ActiveSolanum tuberosum L. · Potato
SE
3 records
Val Red
ActiveSolanum tuberosum L. · Potato
CZ
3 records