Table 1.  Cultivars  used in the experiments

 

Cultivar

Status

Known mildew resistance genes

Golden Promise

Very susceptible control:   a mutation from Maythorpe.

None

 

Diamant

Susceptible control:  a historic Czech variety. 

None

 

SM 4142

Very susceptible control: derived by mutation from Diamant

None

 

HL 70-8

Old breeding  line, derived by mutation and backcross from Diamant

mlo9

Chalice

Current UK recommended variety

mlo11 + ?

Riviera

Current UK recommended variety

mlo11 + ?

Apex

mlo differential variety, formerly grown in most European countries

mlo11 + Mlg

Landlord

Previous UK recommended variety

mlo11 + ?

Chariot

Current UK recommended variety

mlo11 + ?