How to kill Cacti

Access all the information needed for control of this noxious weed, including weed identification, herbicide application and spray timings.

Cacti Description

Cacti Identification

The most successful agents in Australian history, namely the cactoblastis moth, cochineal insect and a mealy bug, continue to keep cacti under control; however, not all biological agents attack all cacti.

Cacti Control

How to kill Cacti

Different application techniques may be used to treat different cacti. Access™ used at 1 L/60 L of diesel applied as an overall spray gives effective control of most cacti. This is the best treatment for quick and economical control of small (seedling) cacti.

Using Grazon™ Extra at 500 mL/100 L of water as a foliar spray will give slow burn down and regrowth may occur, so follow-up application may be necessary. Tordon™ RegrowthMaster at 2.5 L/100 L of water will give effective control of harrisia cactus.

Herbicides for killing Cacti

1:60 with diesel Foliar/Basal bark
Garlon™ 600
1:60 with diesel Foliar/Basal bark
Garlon 600
3 L/100 L of water Foliar
Grazon™ Extra
500 mL/100 L of water Foliar
Tordon™ RegrowthMaster
2.5 L/100 L of water
Harrisa cactus      
Prickly pear (common)  
Snake cactus        
Smooth tree pear      
Tiger pear    
Tree pear        

* Consult label for details of growth stage and use, especially where range of rates is given.

Treatment Timing

Timing for killing Cacti

Treatment should only be carried out when cacti are actively growing. Do not treat during hot, dry summer periods.

PRODUCT Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug
Grazon Extra
Best time to spray/treat
Can spray/treat
if conditions are suitable
Do not spray/treat