Powdery mildew

Contributor: Aarhus Universitet
Date Compiled: 2025
Creative Commons "Attribution-Share Alike"
Pseudoidium neolycopersici (tomato powdery mildew); Symptoms on tomato leaf. February 2016. Image copyright: ©CABI (taken by Dr Philip Taylor)

Prevention

Solution Production stage (if possible with reference to BBCH scale)
Provide good air circulation
From Sowing/Planting to Harvest
Avoid applying excess fertilizer
From Sowing/Planting to Harvest

Solution Production stage (if possible with reference to BBCH scale)
Resistant varieties are available (for example LANCASTER, LUTECIA and ORINADE-Gautìer semeces)
Sowing/Planting

Monitoring

Solution Production stage (if possible with reference to BBCH scale)
Observations on plants are needed: threshold 3% disease severity.
From Sowing/Planting to Harvest

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
Bacillus amyloliquefaciens - FZB24
Microbiological fungicide
From BBCH 10 to BBCH 89
12
(Taegro) Contact organic fungicide. Dosage: 3 Kg/ha
Potassium bicarbonate
Biological fungicide
From BBCH 10 to BBCH 89
(KARMA 85) Contact organic fungicide. Dosage: 5-10 L/ha. Apply preventively from BBCH10 to BBCH85 every 7 days
Basic substance
COS - OGA
Biological fungicide
From BBCH 13 to BBCH 89
5
(IBISCO) Dosage: 2 L/ha
Low risk Active substance
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.