Noach
ActiveLactuca sativa L. · Lettuce
NUNHEMS
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.
Bohemia
ActiveLactuca sativa L. · Lettuce
Enza Zaden B.V.
BG
NL
SK
6 records
Kristine
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
HU
7 records
Multigreen 101
ActiveLactuca sativa L. · Lettuce
Nunhems B.V.
NL
8 records
Multigreen 111
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
8 records
Granite
ActiveLactuca sativa L. · Lettuce
Nunhems B.V.
NL
8 records
Multigreen 172
ActiveLactuca sativa L. · Lettuce
Nunhems B.V., 6083 AB Nunhem
NL
8 records
Noisette
Protection expiredLactuca sativa L. · Lettuce
Enza Zaden B.V.
BG
HR
NL
SI
5 records
Biondonna
ActiveLactuca sativa L. · Lettuce
Bejo Zaden, NL
NL
5 records
Patrona
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
8 records
Prodigio
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
11 records
Mondaï
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
7 records
Multigreen 57
ActiveLactuca sativa L. · Lettuce
Nunhems B.V., Nunhems B.V.
NL
8 records
Duplex
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Hydrolique
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
8 records
Justine
ActiveLactuca sativa L. · Lettuce
HM.CLAUSE
FR
IT
7 records
Lugano
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Expression
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
8 records
Glendana
ActiveLactuca sativa L. · Lettuce
Steven Mitchell, Daniel Trimboli, Enza Zaden Australia Pty Ltd
NL
6 records
Tuska
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
8 records
Skilton
ActiveLactuca sativa L. · Lettuce
Magali Lemont
NL
8 records
Verpia
ActiveLactuca sativa L. · Lettuce
Vilmorin SA (FR)
ES
FR
NL
7 records
Ice Speranza
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
8 records
Tamago
ActiveLactuca sativa L. · Lettuce
Yes applicant details in question 1, Yes applicant details in question 1
NL
8 records