Mordore
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
6 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.
Tassic
ActiveLactuca sativa L. · Lettuce
Seminis Vegetable Seeds
NL
5 records
Musena
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
5 records
Gibbard
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Lumirex
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Edurne
ActiveLactuca sativa L. · Lettuce
ZAADUNIE B.V.
ES
HR
NL
6 records
Denver
ActiveLactuca sativa L. · Lettuce
Seminis Vegetable Seeds
ES
NL
4 records
Redbat
ActiveLactuca sativa L. · Lettuce
ENZA ZADEN
NL
4 records
Capoeira
ActiveLactuca sativa L. · Lettuce
VILMORIN, VILMORIN
FR
5 records
Xem
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
8 records
Hydros
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
8 records
Nadita
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
7 records
Stargo
Application submittedLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
ES
NL
6 records
Galactita
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Barbex
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Batraz
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
7 records
Coriole
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
10 records
Kavalo
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
8 records
Conversion
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Almaral
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
6 records
Wendel
Protection expiredLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
CZ
NL
SK
5 records
Faustina
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
ES
FR
6 records
Focea
TerminatedLactuca sativa L. · Lettuce
GRAINES GAUTIER, S.A.
ES
FR
NL
5 records
Skindel
ActiveLactuca sativa L. · Lettuce
Nunhems B.V.
NL
7 records