Batuka
ActiveLactuca sativa L. · Lettuce
Nunhems B.V.
NL
8 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.
Izigo
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
6 records
Rivalda
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan, NL
NL
6 records
Multired 2
TerminatedLactuca sativa L. · Lettuce
Nunhems B.V.
NL
7 records
Joplin
ActiveLactuca sativa L. · Lettuce
Nunhems B.V., 6083 AB Nunhem
NL
6 records
Multired 208
Application submittedLactuca sativa L. · Lettuce
Nunhems Netherlands B.V.
NL
6 records
Fanfare
ActiveLactuca sativa L. · Lettuce
Harris Moran Seed Company
NL
4 records
Multired 209
Application submittedLactuca sativa L. · Lettuce
Nunhems Netherlands B.V.
NL
6 records
Kiprien
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V, Rijk Zwaan Lettuce Breeding department
NL
6 records
Claudius
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V. (NL)
HR
NL
5 records
Alboreto
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Sideral
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
8 records
Nightcut
TerminatedLactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
FR
5 records
Sirmai
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
ES
FR
6 records
Macaï
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan, NL
NL
6 records
Bottas
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Diablotin
ActiveLactuca sativa L. · Lettuce
ENZA ZADEN
NL
5 records
Thorflash
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
7 records
Pluskin
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
8 records
Rachel
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
CZ
NL
SK
6 records
Campito
ActiveLactuca sativa L. · Lettuce
Cora Seeds, I
NL
6 records
Arusha
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Histrion
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan, NL
FR
5 records
Codex
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records