Downy mildew

Contributor: Université de Liège
Date Compiled: 2025
Creative Commons "Attribution-Share Alike"
Bremia lactucae (downy mildew of lettuce); Initial and later symptoms. Image copyright: ©Dr Philip Taylor (CABI)

Prevention

Solution Production stage (if possible with reference to BBCH scale)
Wide crop rotations
Pre-season
Destroy residues of diseased crops
Pre-season
Increase soil drainage
From Sowing/Planting to Harvest
Reduce crop density
Sowing/Planting
Aerate the greenhouses
From Sowing/Planting to Harvest
Using resistant verieties
Sowing/Planting

Control

Regulations surrounding biological products can change rapidly – always verify products recommended here with the most recent legislation and lists of products registered for your country
Solution Product Category Production stage (if possible with reference to BBCH scale) Max nb. of a. i. application/year Application Details and Notes (commercial product example) Chemical Group
Cerevisane
Defense ellicitor
8
Romeo, 0.75kg/ha
Vitis vinifera L. seed extract
Biological fungicide
BBCH 19 - 49
3
Vitis vinifera L. seed extract, 940 g/ha
Natural compound
13% Bacillus amyloliquefaciens strain FZB24
Biological fungicide
12
Taegro, 0.37 kg/ha
Natural compound

Regulations surrounding chemical products can change rapidly – always verify chemicals recommended here with the most recent legislation and lists of products registered for your country
Solution Product Category Production stage (if possible with reference to BBCH scale) Max nb. of a. i. application/year Application Details and Notes (commercial product example) Chemical Group
See Phytoweb (link in sources) for the most up to date information on chemical products
Oxathiopiprolin
Synthetic fungicide
When first symptoms occur. Suspend treatments 7 days before harvest
2
(ORONDIS PLUS) Dosage in open field: 0,15 L/ha
OSBPI oxysterol binding protein homologue inhibition
Metalaxyl-M
Synthetic fungicide
1
Fubol, 0,2 L/ha, to be mixed with fungicide
PA – fungicides (PhenylAmides)
Fosetyl
Synthetic fungicide
From BBCH 12
2
(Previcur Energy) Dosage: 2,5 l/ha
Phosphonates
Ametoctradine
Synthetic fungicide
BBCH 15-49
2
(ENERVIN® SC) Dosage: 1,2L/ha
QoSI fungicides (Quinone outside Inhibitor, stigmatellin binding type)
Mandipropamid
Synthetic fungicide
Preventive or when first symptoms occur
2
(PERGADO SC®) Dosage: 0,6 L/ha
CAA-fungicides (Carboxylic Acid Amides)
Azoxystrobin
Synthetic fungicide
2
(Amistar) Dosage: 1 L/ha
QoI-fungicides (Quinone outside Inhibitors)
Propamocarb
Synthetic fungicide
From BBCH 12
2
(Previcur Energy) Dosage: 2,5 l/ha
Carbamates
Fluopicolide
Synthetic fungicide
From BBCH 13 to BBCH 49
2
(Infinito) Dosage: 1,6 L/ha
Benzamides
propamocarb hydrochloride
From BBCH 13 to BBCH 49
2
(Infinito) Dosage: 1,6 L/ha
The information made available here has been obtained from or is based upon sources believed by CABI to be reliable but is not guaranteed as to accuracy or completeness. Anyone acting or relying on such information does so entirely at their own risk. The efficacy of the IPM methods included above will depend on local conditions and might not always be suitable everywhere within the specified country.