Topas

Manufacturer
SYNGENTA
Category
Fungicides
Registered until
2026-06-30
Registration number
16765
Active materials
Links
FORMULATION & ACTIVE INGREDIENT:TOPAS is an emulsifiable concentrate containing 100g/l (10.6% w/w) penconazole.
TOPAS contains penconazole for the control of powdery mildew in apples, crab apple, pears, blackcurrants, redcurrants, grapes, outdoor and protected strawberries.
 
DIRECTIONS FOR USE
IMPORTANT: This information is approved as part of the Product Label. All instructions within this section must be carefully read in order to obtain safe and successful use of this product. Where application in by horizontal boom sprayers: Avoid spraying/application within 5 m of the field boundary to reduce effects on non-target insects or other arthropods. Where application is by broadcast sprayers: The best available application technique, which minimises offtarget drift should be used to reduce effects on non-target insects or other arthropods. No information on the safety of TOPAS in Integrated Pest Management systems has been provided and therefore safety cannot be assumed.
  
PROPERTIES OF TOPAS
TOPAS should be used preventatively or in the earliest stages of disease development to minimize risks of resistance. To maintain a high level of protection, applications of TOPAS should not be made consecutivelybut used in alternation with fungicides with different modes of action. Where high infection levels of mildew are present in the crop, use another product to lower the mildew pressure before using TOPAS.
  
DISEASES CONTROLLED
TOPAS is for the control of powdery mildew in apples, crab apples, pears, outdoor blackcurrants and redcurrants, table and wine grapes, outdoor and protected strawberries. A programme of different powdery mildew fungicides is required for season long control.
  
Pome fruit
Podosphaera leucotricha
 
Grapes
Uncinula necator
 
Currants
(Podosphaera mors-uvae)
 
Strawberry
Sphaerotheca macularis
 
Integrated Pest Control
For the latest information consult your specialist advisor. Where insect pests are a problem, a specific insecticide should be used.
 
CROP SPECIFIC INFORMATION
APPLE, PEAR, CRAB APPLES
Crop safety on pears has not been tested. Test on a small area prior to large scale application. TOPAS will reduce the spread of powdery mildew from primary infections and will also control the spread of secondary mildew
RATE OF USE
A rate of 0.5 litres/ha should be used for trees of 3 – 3.5m height at full canopy density. Apply in 250 -1500 l/ ha of water to ensure good crop cover.
Where tree height and/or canopy density is reduced, the dose (and water volume) should be adjusted in accordance with an appropriate dose adjustment scheme. Consult Syngenta or your specialist advisor for further information. Further information on the PACE scheme is available from HDC, or see the HDC leaflet (Orchard Spraying. 
Always spray to achieve a thorough and even coverage of the foliage as this will maximise the protectant properties of the product. Where trees are significantly taller than 3.5m height, the efficacy is likely to be reduced.
TIMING
TOPAS should be applied as a foliar spray from BBCH 71 (fruit size up to 10 mm; fruit fall after flowering. Further applications can be made if disease pressure remains high. A programme of sprays should include not more than 3 sprays of TOPAS in any one season. Allow a minimum of 10 days between applications. The latest time of application is 21 days before harvest.
PROCESSING
Where the crop is destined for processing, consult your processor before treating with TOPAS.
  
OUTDOOR AND PROTECTED STRAWBERRY
RATE OF USE
Apply TOPAS at a rate of 0.5 litres product per hectare. It is important to ensure complete coverage of the plant at all growth stages.
TIMING
For optimum results apply TOPAS preventatively or in the earliest stages of disease development but no earlier than the stated growth stage.
Outdoor strawberries
Apply TOPAS from the beginning of stolen/runner formation, visible about 2 cm long (BBCH 41). Further applications can be made if disease pressure remains high. Up to 2 applications may be made in any one season. Allow a minimum of 10 days between applications.
Protected strawberries
Apply TOPAS preventatively from the 3rd leaf unfolded stage (BBCH 13). Further applications can be made if disease pressure remains high. Up to 4 applications may be made in any one season. Allow a minimum of 10 days between applications. The latest time of application for outdoor and protected strawberries is 3 days before harvest.
VOLUME
Apply in 300-2000 litres of water per hectare.
PROCESSING
Where the crop is destined for processing, consult your processor before treating with TOPAS.
 
BLACKCURRANTS AND REDCURRANTS
TIMING
TOPAS should be used as a protective spray commencing at the first sign of disease (usually mid-late flowering) and continue at 7 day intervals. A further application can be made after harvest to protect plants further. A maximum of 2 applications should be made in any one cropping year.
The latest time of application is 28 days before harvest.
RATE OF USE
TOPAS should be used at the rate of 0.5 litres per hectare. It is important to ensure complete coverage of the plant at all growth stages.
VOLUME
Apply TOPAS in a minimum water volume of 2000 l/ha to achieve good coverage of the foliage without excessive run off.
PROCESSING
Where the crop is destined for processing, consult your processor before treating with TOPAS.
 
TABLE AND WINE GRAPES
RATE OF USE
Apply TOPAS at a rate of 0.3 litres product per hectare. It is important to ensure complete coverage of the plant at all growth stages.
TIMING
Apply TOPAS from the 3rd leaf unfolded stage (BBCH 13). Further applications can be made if disease pressure remains high. Up to 3 applications may be made per crop. Allow a minimum of 8 day between applications. The latest time of application is 28 days before harvest
VOLUME
Apply in at 200-1000 litres of water per hectare.
PROCESSING
Where the crop is destined for processing, consult your processor before treating with TOPAS.
 
MIXING AND SPRAYING
For outdoor use apply through conventional crop spraying equipment.Apply using a medium quality spray as defined by BCPC. A spray pressure of at least 2 bar is preferred.
Applications for the protected uses should be made via hydraulic nozzle applicator e.g. motorised sprayer with hand lance or boom lance or knapsack applications.
Make sure the sprayer is set to give an even application at the correct volume.
Fill the spray tank with half the required volume of water and begin agitation. Add the required amount of TOPAS and continue agitation while adding the rest of the water. Agitate the mixture thoroughly before use and continue agitation during spraying. Thoroughly wash all spraying and measuring equipment with water and a wetting agent immediately after use. Do not leave the spray liquid in the sprayer for long periods (such as during meal breaks or overnight).
 
RESISTANCE
TOPAS contains penconazole, a DMI fungicide. The possible development of disease resistant to TOPAS cannot be excluded or predicted. Disease control may be reduced accordingly if strains of fungi resistant to penconazole develop.
Registered for culturesRatePreharvest Interval
Apples0.5 l21
Red currant0.5 l28
Black currant0.5 l28
Pears0.5 l21
Strawberries0.5 l3
Grapes0.3 l28