How to use Access®


Access® Herbicide

Specialised product for robust control of almost any woody weed via the cut stump or basal bark application technique. Access offers a solution for very targeted woody weed control in environmentally sensitive situations.

Access – overview

Product key features

  • Specialty herbicide for use as a cut stump or basal bark treatment to control a range of woody weeds.
  • Formulated to be mixed with diesel or in environmentally sensitive situations with Biosafe®.
  • Through the specialised application techniques, provides targeted weed control with minimal off-target risk.
  • Via basal bark treatment, provides excellent control of thin-barked saplings and multi-stemmed weeds where foliar spraying would be difficult or pose a risk to the environment.
  • Via cut stump treatment, prevents regrowth of trees following mechanical control.

Product specifications

  • Ingredients:

    240 g/L triclopyr + 120 g/L picloram

  • Formulation:

    Emulsifiable concentrate liquid

  • Pack sizes:

    1 L and 5 L

Major weeds controlled

  • African boxthorn control
  • Cacti control
  • Eucalyptus regrowth control
  • Lantana control
  • Manuka control
  • Sweet briar control
  • Wattle regrowth control

Woody Weed Control Guide


Use the controls at the bottom of the page to get the most from this useful new tool from the Woody Weed Specialists.

Find out more

Access – application

Equipment required for application

  • Suitable knapsack or small pressure pump spray unit.
  • Measuring jug.
  • Cotton overalls or long-sleeved shirt and long trousers.
  • Washable hat.
  • Elbow-length neoprene gloves.
  • Safety glasses or face shield.

Application rate

Always check the label for the correct rate. A copy of the label can be accessed here.

Only mix Access with diesel or Biosafe. Never mix Access with water.

Correct mixing procedure

Only mix Access with diesel or Biosafe.

Quarter fill the spray unit with diesel or Biosafe then add the Access. Complete the filling with diesel or Biosafe and agitate well.

Only mix enough Access for each day’s work and use the mix within 24 hours.

Application timing for best results

Access 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. 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 Access 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.

To ensure maximum penetration, do not apply an Access mix to charcoal-coated or wet stems as this will compromise penetration and minimise efficacy.

Application methods

Mix with diesel or Biosafe (these act as penetrants) and apply as a basal bark or cut stump application. Access is NOT designed to be mixed with water.

Both the basal bark and cut stump application methods should be applied at very low pressures from the knapsack and the nozzle adjusted to very coarse, to a point where the mixture will stream/dribble out and not spray or mist.

a) Basal bark application

Using a knapsack or small pressure sprayer, apply the spray mix to the stems or trunk of the target weed from the ground up to a height of 30 cm (the base, hence basal bark). Ensure that the entire circumference of the stems or trunk is treated.

Ensure that the sprayed surface is wet to the point of run-off. Where possible, ensure buds at or below the soil surface are treated.

For weeds with multiple stems, ensure each one is treated around the entire circumference.

Basal bark treatment is generally effective when weed stems are up to 5 cm in diameter. When stem diameter exceeds 5 cm, a cut stump application is recommended.

b) Cut stump application

First, cut the tree/sapling leaving an exposed stump. Ideally the cut stump surface will be horizontal to the ground to prevent chemical run-off. Using a knapsack or small pressure sprayer, apply the spray mix to the cut surface of the trunk, the sides of the stump and any roots above the soil surface.

It is important that the spray mix be applied immediately after the stem is cut to maximise the penetration into the stump.

Ensure that the sprayed surfaces are thoroughly wet.

Videos demonstrating the correct techniques for both basal bark and cut stump applications can be accessed here.

c) ThinLine application

Videos demonstrating the correct technique for ThinLine application can be accessed here.

Access – safety

Safe handling

Access is classed as a Poison and must be kept out of the reach of children.

The product can irritate the eyes and skin, particularly in the concentrated form, so take care when measuring it out and adding it to the spray unit. If any does splash into your eyes or onto your skin, wash immediately with clean water. Wear suitable protective clothing when measuring out the product and when spraying, such as overalls or a long-sleeved shirt and long trousers, along with a washable hat, elbow-length neoprene gloves and safety glasses or a face shield. Wash all clothing after use.

A copy of the Safety Data Sheet can be accessed here.

Safe to stock

Access poses little risk to stock and the application method means that there is no stock grazing withholding period. This means that stock do not need to be removed from paddocks during treatment.



Impact of Access on the environment

Health and safety profile sheet

Use the controls at the bottom of the page to get the most from this useful new tool from the Woody Weed Specialists.

Many desirable crops and ornamentals are very sensitive to Access so care must be taken when applying the product to avoid contact with desirable plants.

Plants susceptible to Access include (but are not limited to) fruit trees, grape vines, legumes (pea, beans, lucerne, etc.), potatoes, roses, shade trees and tomatoes.

Residues of Access can remain active in the soil for many months, with the longevity affected by use rate, soil type, temperature and moisture. Care therefore needs to be taken when planting new crops or trees into areas where Access has been applied to ensure that no residues remain active.



Cleaning spray equipment

After spraying is complete, thoroughly clean the spray unit to ensure no residues remain that may cause damage to desirable plants when the equipment is next used. After completion of spraying use a degreaser such as Caltex Kwik-D-Grease® to remove traces of diesel from the sprayer, rinse the tank and spray through nozzles thoroughly with water to remove the degreaser.

After the above, wash the tank, hoses and nozzles with a mix of water and an alkaline laundry detergent such as Omo® or Drive®. Shake the water around in the sprayer and spray the solution through the nozzle to thoroughly clean the lines and nozzle. Rinse well with water to remove the detergent.

If Access and diesel are applied as a cut stump using a brush and pot, spray liberally with degreaser, hose off thoroughly and repeat using detergents as above.

Ensure rinse water is disposed onto a designated area or an unused area where there is no risk to desirable plants.