Sherin
Application submittedLactuca sativa L. · Lettuce
Nunhems Netherlands B.V.
NL
7 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.
Pleasance
ActiveLactuca sativa L. · Lettuce
Bejo Zaden, NL
NL
6 records
Shangore
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds BV (NL)
FR
HR
NL
6 records
Patagonia
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Splashbee
ActiveLactuca sativa L. · Lettuce
NUNHEMS
ES
NL
8 records
Caravel
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
10 records
Verdagio
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
8 records
Bacchus
ActiveLactuca sativa L. · Lettuce
Vilmorin, F
FR
6 records
Klee
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V, Rijk Zwaan Lettuce Breeding department
NL
7 records
Winbee
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
7 records
Crispita II
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
9 records
Euler
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
8 records
Safír
ActiveLactuca sativa L. · Lettuce
MORAVOSEED
CZ
SI
SK
5 records
Lotus
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Diamond
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
5 records
Soleilan
TerminatedLactuca sativa L. · Lettuce
Syngenta Seeds BV (NL)
ES
FR
HR
NL
5 records
Michelagio
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
9 records
Red Crispita II
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
10 records
Annisole
ActiveLactuca sativa L. · Lettuce
SYNGENTA SEEDS B.V.
NL
7 records
Analena
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V. (NL)
HR
NL
5 records
Ice Circle
ActiveLactuca sativa L. · Lettuce
ZONNEVELD OLAF
NL
10 records
Satine
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
7 records
Garone
ActiveLactuca sativa L. · Lettuce
Vilmorin, F
FR
7 records
Pedrola
ActiveLactuca sativa L. · Lettuce
JONATHAN SINCLAIR (ENZA ZADEN BEHEER B.V.)
NL
7 records