Mazur
ActiveLactuca sativa L. · Lettuce
HAZERA SEEDS B.V.
NL
5 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.
Classio
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
6 records
Cerveira
Protection expiredLactuca sativa L. · Lettuce
Syngenta Seeds, NL
NL
5 records
SV3413LC
ActiveLactuca sativa L. · Lettuce
VEGETABLE MONSANTO B.V.
NL
7 records
Acherito
ActiveLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
2 records
Matelo
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Carmanda
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Sinisa
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
3 records
Dilago
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
3 records
Gotham
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Labiba
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Imagination
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
3 records
Burette
Application submittedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
3 records
Xaranga
Application submittedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
3 records
Elytis
TerminatedLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
3 records
Tupelo
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Albenitez
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 records
Asturinas
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
4 records
Samburu
ActiveLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
2 records
Joanice
TerminatedLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Jarlsberg
WithdrawnLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
3 records
Campbelle
Application submittedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
3 records
Galwen
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado SAS (FR)
FR
2 records
Goodison
TerminatedLactuca sativa L. · Lettuce
VAN DER LAAN RON
NL
3 records