Chemical control of restricted invasive plants

Chemical control of weeds involves the use of herbicides. Herbicides control weeds either by speeding up, stopping, or changing the weed’s normal growth patterns. This affects the weed by drying out the leaves or stems, or by making it drop its leaves. Also see Councils website on subsidies and equipment offered for pest plant control.

Manual control

Manual control is the use of the hands or handheld tools to deal with weeds. An advantage of manual control is that it minimises soil disturbance, and decreases the likelihood of erosion and weed seed germination.

Mechanical control

Mechanical control is the use of powered tools and machinery to manage weeds and is best suited to larger infestations. Care should be taken to minimise soil disturbance.


Biological control

Biological control involves the use of insects or pathogens (diseases) that affect the health of the weed. Usually, these biocontrol agents are from the same country of origin as the weed species.

Biosecurity Queensland undertakes biological weed control research in Queensland. Strict measures are in place to ensure that these agents do not negatively affect native plants and animals or horticultural and agricultural crops.

Biosecurity Queensland’s biological control group is presently working on 10 weeds of concern to Queensland:


Biological control agents can reduce the vigour, size and competitiveness of weed infestations; however, they rarely get rid of weeds altogether. Biological control works best in conjunction with other control methods. See Councils webpage for Subsidies in assisting with the control of restricted invasive plants.

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