Weed Control

Woody weed infestation in Australia costs millions in tax payer funded controls and lost land productivity. Governments and landowners alike have a responsibility and an obligation to manage woody weeds and, in the case of Parkinsonia and Prickly Acacia, this is mandated under legislation.

Current methods of control include chemicals, mechanical clearing and burning. BHA’s biological solution is to induce dieback disease in the woody weeds, resulting in a long-term epidemic in the plant population, and can be integrated with other management strategies or used independently.

BHA’s Di-Bak – How it works


  •  BHA’s Di-Bak  is the only known bioherbicide aimed at woody weed control.
  •  It is produced in BHA’s plant under a controlled environment, utilising bioprocessing, encapsulation and packaging.
  •  It can be used as a stand-alone solution or to supplement chemical and mechanical controls as part of an integrated weed management plan.
  •  The three pathogens contained in Di-Bak Parkinsonia are naturally occurring fungi found to kill Parkinsonia widely across northern Australia.  In locations where they have been found, these fungi have not had any negative effect on native or endemic plant species.
  •  Di-Bak is applied using capsules that contain the biological control fungi.
  •  The capsule is inserted into the tree trunk through a freshly drilled hole. The hole is then sealed with a silicone sealant or a plug.
  •  The number of capsules required depends on the size of the tree and number of surrounding woody weeds.  Up to 5 capsules can be applied per tree.
  •  The dieback induced by Di-Bak takes 6-12 months to severely infect an inoculated tree and somewhat longer to express the full effect of killing the plant and spreading in a thicket.
  •  The induced dieback triggers a long term epidemic which prevents seedlings from developing.
  • Several years after Di-Bak treatment Parkinsonia populations should be greatly weakened, leading to eradication.

Register your interest in BHA's Weed Control

Parkinsonia seedlings

Parkinsonia seedlings overtaking land