Budgee
Application submittedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
4 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.
Coralis
TerminatedLactuca sativa L. · Lettuce
Graines Gautier SA (FR)
FR
NL
5 records
Piroulie
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
4 records
Bartal
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
3 records
Nevanas
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Magician
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
5 records
Cherice
ActiveLactuca sativa L. · Lettuce
BEJO ZADEN
NL
6 records
Flandria
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Luxion
Application submittedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
3 records
Starena
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
7 records
Liano
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
6 records
Greenbel
ActiveLactuca sativa L. · Lettuce
BEJO ZADEN
NL
10 records
Stretcha
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
5 records
Philemo
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V. / Enza Zaden Beheer B.V.
NL
6 records
Kimani
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Cortesita
ActiveLactuca sativa L. · Lettuce
Syngenta UK Ltd
NL
6 records
Anandra
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
6 records
E01K30369
TerminatedLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
5 records
Lambole
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
6 records
Veraine
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Orelian
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
5 records
Osterley
ActiveLactuca sativa L. · Lettuce
A L TOZER LTD
NL
3 records
Burela
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Waygo
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
NL
6 records