Pacito
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
1 record
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.
Walwin
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
2 records
Bourguignonne
ActiveLactuca sativa L. · Lettuce
Domaine Public (FR)
FR
1 record
Limonelo
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
1 record
WAMBA
Application submittedLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
1 record
LOCARNO RZ (85-81 RZ)
WithdrawnLactuca sativa L. · Lettuce
RIJK ZWAAN Z.Z. B.V.
ES
1 record
Citigo
WithdrawnLactuca sativa L. · Lettuce
Nunhems B.V.
NL
2 records
Lisamba
Application submittedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
2 records
Panacola
Application submittedLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
4 records
Naomi
Application submittedLactuca sativa L. · Lettuce
MARALDI SEMENTI S.r.l.
IT
1 record
Raffaella
ActiveLactuca sativa L. · Lettuce
Panora s.p.a.
NL
1 record
Papyon
Application submittedLactuca sativa L. · Lettuce
Yuksel Seeds B.V.
NL
2 records
ADIONE
ActiveLactuca sativa L. · Lettuce
MERIDIEM SEEDS S.L.
ES
1 record
CONSTANTINA
ActiveLactuca sativa L. · Lettuce
RAMIRO ARNEDO, S.A.
ES
1 record
Cadabra
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
1 record
Greenpick
TerminatedLactuca sativa L. · Lettuce
Barb Neubert
DE
2 records
Gradisca
WithdrawnLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
MSX19155
Application submittedLactuca sativa L. · Lettuce
MARALDI SEMENTI S.r.l.
IT
1 record
MSX19307
Application submittedLactuca sativa L. · Lettuce
MARALDI SEMENTI S.r.l.
IT
1 record
CIBELES
Application submittedLactuca sativa L. · Lettuce
MERIDIEM SEEDS S.L.
ES
1 record
Mysteria
ActiveLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
1 record
MSX 211379
Application submittedLactuca sativa L. · Lettuce
Maraldi Sementi SRL (IT)
FR
1 record
Barlata
WithdrawnLactuca sativa L. · Lettuce
NL
2 records
Sigla
TerminatedLactuca sativa L. · Lettuce
NL
1 record