Acropole
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
4 records
Diseases
Downy mildew of lettuce
Lactuca sativa L.
A fungal disease of lettuce caused by the obligate oomycete Bremia lactucae, characterized by high pathogen variability and the appearance of chlorotic angular spots with sporulation on the underside of leaves.
In the reference 2 007 varieties crop Lettuce, where this is mentioned in the description.
The disease is caused by the oomycete Bremia lactucae Regel, which exhibits high genetic variability. Pathogen populations include numerous physiological races, designated by the code Bl followed by a sequence number, the composition of which is constantly changing, making it difficult to maintain cultivar resistance.
Symptoms appear as chlorotic angular spots on the upper side of the leaf, restricted by veins. On the underside, a characteristic loose whitish, gray, or violet sporulation layer forms. Affected tissues become necrotic, leading to leaf desiccation and stunted seedling growth.
Breeding for resistance is based on the use of Dm-genes (Downy mildew) and quantitative trait loci (QTL). Cultivar resistance is determined by the ability to withstand specific races of the pathogen; however, the effectiveness of protection is limited due to the ability of local Bremia lactucae populations to overcome genetic resistance.
General information about the subject — on the page Downy mildew.
Varieties of Lettuce mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Onigo
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Cerler
ActiveLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
2 records
Caneira
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Baqueira
ActiveLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
2 records
Pagero
TerminatedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Oceanis
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Dicata
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Gendry
ActiveLactuca sativa L. · Lettuce
Nunhems Netherlands B.V.
NL
3 records
Bancola
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
5 records
Maseta
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
3 records
Ortuna
Application submittedLactuca sativa L. · Lettuce
Nunhems Netherlands B.V.
NL
3 records
Telepati
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado SAS (FR)
FR
3 records
Solara
ActiveLactuca sativa L. · Lettuce
SEMILLAS BATLLE, S.A.
ES
3 records
Zetiva
TerminatedLactuca sativa L. · Lettuce
NUNZA BV
ES
3 records
Otis
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Kiriole
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
7 records
Nolwen
TerminatedLactuca sativa L. · Lettuce
Vilmorin-Mikado SAS (FR)
FR
3 records
Abigale
ActiveLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
2 records
Manarola
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado SAS (FR)
FR
2 records
Olanice
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Twittal
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
3 records
Charlestone
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado SAS (FR)
FR
3 records
Atavir
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records