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Tri-Base Blue


Tri-Base Blue is a protectant copper fungicide used for the control of many diseases on fruit, vegetable and ornamental crops.

  • Provides superior coverage and adhesion due to the ultra-fine particle size
  • A stable, solvent free, copper formulation
  • Easy to pour, mix into solution, handle and apply


Active Ingredient:  190g/L Copper as tribasic copper sulphate


Formulation:             Soluble concentrate


What is Tri-Base Blue?

Copper fungicides have been used by fruit and vegetable growers for many years as protectant treatments to prevent spore germination on plant tissue. Fungicides based on copper provide cost effective disease control but also have an additional benefit over non-copper fungicides which is their activity against bacterial pathogens.

Tri-Base Blue is a unique liquid formulation of a copper compound that provides a useful alternative to the traditional copper products based on granule or wettable powder formulations.

Tri-Base Blue stands alone as the only liquid copper fungicide available that contains tri-basic copper sulphate as the active ingredient.


How do copper fungicides work?

The key to successful disease protection with copper is two words – foliar coverage.

Plant surfaces need to have a complete coverage of copper fungicide to defend the plant against infection. Copper fungicides work by preventing spore germination and can act at several stages in the fungus development. Any plant surface left untreated remains a potential disease infection site.

Coverage is far more important than the quantity of actual copper on the plant surface. And that is why particle size is important.

The ultra-fine particles of Tri-Base Blue, where 70% of particles are less than one micron, provide a greater surface area than alternative products with larger particles. This allows the copper to exert its full potential against fungi and bacteria.

In the presence of moisture the copper ions become active. Therefore they protect against diseases that develop in the same conditions e.g. downy mildew in grapes.

If conditions remain dry the copper ions are not released. Diseases that favour these conditions (e.g. powdery mildew in grapes) are able to prosper and cause infection as the level of available copper is insufficient for disease control.


Tri-Base Blue: The Formulation

Copper compounds, once dried, can never fully regain the previous level of hydration or activity. Using advanced technology Nufarm chemists at Linz developed a new, patented manufacturing method for tri-basic copper.

To further enhance the performance of this novel product, the tri-basic copper sulphate was blended with high quality wetting and dispersing agents to produce a liquid copper fungicide of exceptional quality.


Mixing Directions

Tri-Base Blue is an extremely stable formulation and requires only minimal shaking before use. It moves rapidly into suspension on addition to the spray tank. The required amount of Tri-Base Blue should be added when the tank is one third full and under constant agitation. The tank should be completely filled while agitation continues.



Tri-Base Blue is compatible with most commonly used fungicides and insecticides as a tank-mix. If compatibility is in question, use the compatibility jar test before mixing a whole tank.


Crop Disease Rate/100L Rate/ha Remarks
Avocados  Anthracnose  280ml 2.8-5.6L
(mature trees)
  Apply at monthly intervals from flowering until harvest. During prolonged wet weather reduce the application interval to 14 days.
 Citrus  Melanose  280ml 5.6L
(mature trees)
  Apply as a dilute spray during pre and post bloom periods.
   Brown rot  420ml 5.6L
  Apply as a dilute spray during pre and post bloom periods.
Grapes Downy mildew 250-350ml 2.5-3.5L
Apply in autumn.
Kiwifruit Leaf spot
(Phomopsis spp
and other e.g.
280ml 2.8-5.6L Apply when shoots are 10cm long and repeat at 10-14 day intervals. Use the higher rate when conditions are favourable for infection.

PSA-Limited Claim.

The efficacy of this claim is not fully proven*

Pseudomonas syringae pv actinidiae

280ml 2.8-5.6L Apply after harvest and during the dormant period. Caution: Copper sprays may cause injury if applied during the growing season.
    150ml Up to 1.5L Budbreak to the start of flowering: Apply
to give complete coverage using up to 1000
litres of water/ha. To minimize possible leaf
damage it is recommended that no more
than three copper sprays are applied, at least 10-14 days apart, in a programme with other products which are effective against PSA.Do not apply to open flowersPost Flowering to Harvest: Applications of
copper in the post flowering period are not
recommended as fruit marking may occur in
some situations.
Onions Downy mildew
Bacterial blight
280ml 3L Apply when disease first appears and repeat every 10-14 days while conditions allow infection. 
Peas Downy mildew
Ascochyta blight
Bacterial blight
280ml 3L Apply from emergence at 10-14 day intervals while conditions allow infection.
Potatoes Early blight
Late blight
280-450ml 3-4.5L Apply every 7-10 days from when plants are 15cm high until just before harvest.
Stonefruit Leaf curl
Shot hole
Bladder plum
280-350ml 5.6-7.0L Apply in autumn at leaf fall. Apply in spring when buds are swelling but before and within one week of any buds opening. A repeat application can be made 10-14 days later.
  Bacterial blast 350-500ml 7.0L
 Apply at leaf fall and repeat at monthly intervals throughout the winter, then treat as for leaf curl.

Note: Refer to the Tri-Base Blue label for use recommendations on a much wider range of crops.

*WARNING: Copper sprays may be phytotoxic to kiwifruit leaves, flowers, or fruit and the conditions under which damage can occur have not been fully determined. Higher rates, weather conditions, multiple applications, fruitlet stage, slow drying, tank mixtures and other products used before or after any copper spray may increase the risk of damage. Copper damage may take several weeks to fully develop. Discontinue the use of copper if damage becomes apparent and unacceptable. Tri-Base Blue may be applied in tank mixture with Actigard. Otherwise do not apply within a week of other pesticides and adjuvants (unless proven safe), or within at least two weeks of oils, amino acids, foliar fertilizers, or acidifying compounds. Before applying Tri-Base Blue read the Conditions Of Sale on the label. If these conditions are not acceptable, do not use. Any adverse event resulting from the use of this product must be notified to Nufarm Limited.


Withholding Period

Nil on all crops.


This product is exclusive to Fruitfed Supplies.