Danilo
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer
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.
Nimus
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Mamutik
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Standanas
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Ximenes
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
6 records
Balbinas
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Bocado
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
FR
4 records
Closinas
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
4 records
Fanugo
TerminatedLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
5 records
Lidivia
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Blanes
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Adelita
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
9 records
Frizella
TerminatedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V. (NL)
HR
NL
5 records
Redza
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
5 records
Ovired
ActiveLactuca sativa L. · Lettuce
ENZA ZADEN
NL
3 records
Surefire
TerminatedLactuca sativa L. · Lettuce
VILMORIN-MIKADO USA
FR
4 records
Rougana
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer
NL
5 records
Xaroma
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
5 records
Dartmore
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Publius
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Allana
TerminatedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
5 records
Rooney
Application submittedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Lores
ActiveLactuca sativa L. · Lettuce
Vilmorin SA (FR)
FR
4 records
Susanita
ActiveLactuca sativa L. · Lettuce
Bejo Zaden B.V.
NL
5 records