Powdery mildew

Contributor: AgriNewTech
Date Compiled: 2024
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)
Plant in sunny areas as much as possible
Sowing/Planting
Provide good air circulation
From Sowing/Planting to Harvest
Avoid applying excess fertilizer
From Sowing/Planting to Harvest
Overhead sprinkling may help reduce powdery mildew
From Sowing/Planting to Harvest
Calcium fertilizer treatments
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
Prediction models are not available.
From Sowing/Planting to Harvest

Control

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
Ampelomices quisqualis M-10
Microbiological fungicide
From BBCH 10 to BBCH 89
12
(AQ-10) Contact organic fungicide. Dosage: 35-70 g/ha. Keep the suspension in agitation during the application
Bacillus amyloliquefaciens - FZB24
Microbiological fungicide
From BBCH 10 to BBCH 89
12
(Taegro) Contact organic fungicide. Dosage: 3 Kg/ha
Bacillus amyloliquefaciens plantarum - D747
Microbiological fungicide
From the appearance of the first symptoms to BBCH 89
6
(Amylo-X) Dosage: 1,5-2,5 Kg/ha
Bacillus pumilus - QST 2808
Microbiological fungicide
From BBCH 10 to BBCH 89
6
(Sonata) Contact organic fungicide. Dosage: 5-10 L/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
Eugenol
Biological fungicide
From BBCH 42 to BBCH 89
5
(3LOGY) Fungicide based on terpenes that acts by contact, with activity preventive control. Dosage: 2-3 L/ha
Natural compound
Geraniol
Biological fungicide
From BBCH 42 to BBCH 89
5
(3LOGY) Fungicide based on terpenes that acts by contact, with activity preventive control. Dosage: 2-3 L/ha
Natural compound
Thymol
Biological fungicide
From BBCH 42 to BBCH 89
5
(3LOGY) Fungicide based on terpenes that acts by contact, with activity preventive control. Dosage: 2-3 L/ha
Natural compound
Sulfur
Biological fungicide
From BBCH 10 to BBCH 89
6
(Tiovit Jet) Dosage 1,5-5 Kg/ha. Tiovit Jet is not compatible with alkaline insecticides and mineral oils.
Inorganic

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 Risk resistance (FRAC Code)
Boscalid
Synthetic fungicide
When first symptoms occur
3 (Among Boscalid, Fluopyram, Pentyopirad, Fluxapyroxad, Isopyrazam)
(BAS 510 01 F) Contact fungicide with translaminar properties. Dosage 0,2 Kg/ha
SDHI (Succinate dehydrogenase inhibitors)
Medium to high risk. (7)
Cyflufenamid
Synthetic fungicide
When first symptoms occur. Suspend treatments 1 day before harvest
2
(TAKUMI) Dosage: 150mL/ha.
Phenylacetamide
Resistance in Sphaerotheca. Resistance management required (U06)
Difenoconazole
Synthetic fungicide
When first symptoms occur. Suspend treatments 3 days before harvest
2 (Among all SBIs)
(DISCO) Broad spectrum systemic fungicide that acts by contact, with preventive control of the activity. Dosage: 0,3-0,5 L/ha
DMI-fungicides (DeMethylation Inhibitors) (SBI: Class I)
Medium risk (3)
Fluxapyroxad
Synthetic fungicide
When first symptoms occur. Suspend treatments 3 days before harvest
3 (Among Boscalid, Fluopyram, Pentyopirad, Fluxapyroxad, Isopyrazam)
(ALLSTAR) Dosage 0,15 L/ha. Fluxapyroxad shows a marked preventive activity, combined with a prolonged persistence over time
SDHI Succinate dehydrogenase inhibitors
Medium to high risk. (7)
Penconazole
Synthetic fungicide
From BBCH 14. Suspend treatments 3 days before harvest
2 (Among all SBIs)
(Topas® 10 EC) Dosage: 0,5L/ha. Broad spectrum systemic fungicide with preventive, curative and blocking activity
DMI-fungicides (Demethylation inhibitors) (SBI: Class I)
Medium risk (3)
Pyraclostrobin
Synthetic fungicide
When first symptoms occur. Suspend treatments 7 days before harvest
3 (Between Pyraclostrobin, Tryfloxistrobin and Azoxystrobin)
(CABRIO TOP) Cover fungicide with preventive activity. Dosage: 1,5-2 Kg/ha
QoI-fungicides (Quinone outside inhibitors)
High risk (11)
Tebuconazole
Synthetic fungicide
When first symptoms occur. Suspend treatments 3 days before harvest
2 (Among all SBIs)
(ARES 430 SC) Fungicide in concentrated suspension formulation with preventive, curative and eradicating action. Dosage: 580 mL/ha
DMI-fungicides (Demethylation inhibitors) (SBI: Class I)
Medium risk (3)
Tetraconazole
Synthetic fungicide
When first symptoms occur. Suspend treatments 7 days before harvest
2 (Among all SBIs)
(CONCORDE 125) Broad spectrum systemic fungicide. Dosage: 0,2-0,36 L/ha
DMI-fungicides (Demethylation inhibitors) (SBI: Class I)
Medium risk (3)
Isopyrazam
Synthetic fungicide
When first symptoms occur. Suspend treatments 1 day before harvest
3 (Among Boscalid, Fluopyram, Pentyopirad, Fluxapyroxad, Isopyrazam)
(REFLECT®) Dosage: 11L/ha
SDHI (Succinate dehydrogenase inhibitors)
Medium to high risk. (7)
Tryfloxystrobin
Synthetic fungicide
From pre-bloom to pre-harvest. Suspend treatments 3 days before harvest
3 (Between Pyraclostrobin, Tryfloxistrobin and Azoxystrobin)
(FLINT MAX) Dosage: 300 g/ha
QoI-fungicides (Quinone outside inhibitors)
High risk (11)
Azoxystrobin
Synthetic fungicide
When first symptoms occur. Suspend treatments 3 days before harvest
3 (Between Pyraclostrobin, Tryfloxistrobin and Azoxystrobin)
(ORTIVA®) Dosage: 0,8-1 L/ha
QoI-fungicides (Quinone outside inhibitors)
High risk (11)
Bupirimate
Synthetic fungicide
From BBCH 10 to BBCH 89. Suspend treatments 3 days before harvest
2
(NOMROD 250 EW) Dosage: 0,3 L/ha
Hydroxy- (2-amino-) pyrimidines
Medium risk (4)
Metraphenone
Synthetic fungicide
When first symptoms occur. Suspend treatments 3 days before harvest
2
(VIVANDO) Dosage: 0,3 L/ha
Aryl-phenylketones
Medium risk (50)
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.