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 or Biosafe 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

COMMON NAMEAccess® 1:60 with diesel/Biosafe / Foliar/Basal barkGarlon® 600 1:60 with diesel/Biosafe / Foliar/Basal barkGarlon 600 3 L/100 L water / FoliarGrazon®Extra 500 mL/100 L water / FoliarTordon® RegrowthMaster 2.5 L/100 L water / Foliar
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.

Grazon Extra
Key: Best time to spray/treat Can spray/treat if conditions are suitable Do not spray/treat