Izabita II
ActiveLactuca sativa L. · Lettuce
Syngenta Crop Protection AG
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.
Partition
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
5 records
Baleron
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
FR
5 records
Ikebanas
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan, NL
NL
6 records
Curletta
TerminatedLactuca sativa L. · Lettuce
Syngenta Seeds
NL
6 records
Mercato
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
5 records
Farito
ActiveLactuca sativa L. · Lettuce
VRIEND RONALD JAN
NL
8 records
Oakus
ActiveLactuca sativa L. · Lettuce
BEJO ZADEN
NL
5 records
Invicta
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Baeza
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Cartagonova
ActiveLactuca sativa L. · Lettuce
Seminis Vegetable Seeds
ES
NL
4 records
Eduardo
ActiveLactuca sativa L. · Lettuce
VRIEND RONALD JAN
NL
8 records
Multigreen 161
ActiveLactuca sativa L. · Lettuce
Nunhems B.V.
NL
6 records
Ice Pop
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds BV, Netherlands
NL
7 records
Shepard
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Kalat
ActiveLactuca sativa L. · Lettuce
Yes, RIJK Zwaan lettuce breeding department
NL
7 records
Merlot
ActiveLactuca sativa L. · Lettuce
MoravoSeed, CZ
CZ
4 records
Multigreen 185
ActiveLactuca sativa L. · Lettuce
NUNHEMS
NL
7 records
Ilona
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
FR
NL
8 records
Livorno
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Erasmus
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
7 records
Thatcher
TerminatedLactuca sativa L. · Lettuce
Nunhems B.V.
NL
7 records
Damion
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
NL
7 records
Rubagio
ActiveLactuca sativa L. · Lettuce
Syngenta Seeds B.V.
NL
9 records