Mix with water and apply via stem injection or cut stump method.
a) Stem injection application:
Make injection pockets (horizontal cuts) at waist height using a small axe with a 5–7 cm blade. The cut must be through the bark and sufficiently deep so that the injected chemical will be in contact with the sap but not so deep as to penetrate the heartwood. Leaving the axe in the tree, inject the chemical using a vaccinator set to deliver 1 mL (or 2 mL) so that the chemical runs down the blade into the injection pocket, remove axe and repeat (see video demonstration, link below).
Injection pockets should be formed around the circumference of the sapling with the distance between the centre of each cut being between 10 and 15 cm. Inject 1 mL/cut for regrowth less than 30 cm diameter when measured at the base. Inject 2 mL/cut on larger regrowth.
Take care on small diameter saplings to ensure that the injection pocket is not made too wide so that injected chemical runs out of the side of the cut. Injection pockets should also be staggered (not made at the same height) to avoid creating a weak point at which the top growth will break away in strong wind.
Stem injection can also be made using a basal tree injector such as the one produced by Tree Spear Pty Ltd – see here for more information.
A video demonstrating the correct technique for stem injection application can be accessed here.
b) Cut stump application:
First, cut the tree/sapling leaving an exposed stump. All stems should be cut less than 10 cm above the ground and horizontal to the ground to prevent chemical run-off. Cut and treat all suckers below the main stem cut height.
Using a knapsack or small pressure sprayer, apply the spray mix to the cut surface of the trunk ensuring that the sprayed surface is thoroughly wet. The cut surface is the sole access of the mixture into the plant. It is important that the spray mix be applied IMMEDIATELY after the stem is cut to maximise the penetration into the stump.
A video demonstrating the correct technique for cut stump applications can be accessed here.
Equipment Required for Application
- Suitable knapsack or small pressure pump spray unit (for cut stump applications).
- Small (3/4 length) axe (for stem injection).
- Vaccinator with tree injector kit (for stem injection).
- Measuring jug.
- Cotton overalls or long-sleeved shirt and long trousers.
- Washable hat.
- Elbow-length chemical resistant gloves.
- Safety glasses, goggles or face shield.
Application Timing for Best Results
Tordon RegrowthMaster is most effective when applied to weeds that are not stressed due to lack of moisture, excessive heat, previous herbicide treatment, etc. and are actively growing with active sap flow. Actively growing weeds will draw the chemical into the vascular system and transport it down to the roots to ensure maximum efficacy. Provided the target weeds are not stressed, application of Tordon RegrowthMaster via either treatment method can occur throughout the year.
A general guide to the best time of the year to treat common woody weeds can be found in this table.
a) Cut stump application:
Use 50 mL of Tordon RegrowthMaster in 10 L of water and always check the label before use. A copy of the label can be accessed here.
b) Stem injection application:
Dilute at 1:4 in water and depending upon the sapling size, apply 1–2 mL of the mix per injection pocket (cut). Always check the label for the correct rate. A copy of the label can be accessed here.
Correct Mixing Procedure
Where possible, mix Tordon RegrowthMaster with clean water sourced from town supply or a rain water tank. Clean dam or river water may be used as long as it is not high in metal ions such as magnesium and calcium or ions that bind to the chemical and reduce herbicide efficacy. Fill the spray unit with water then add the Tordon RegrowthMaster and agitate well.
Only mix enough Tordon RegrowthMaster for each day’s work and use the mix within 24 hours.