Siam weed detected in the Top End


Siam weed (Chromolaena odorata) was recently detected in the greater Darwin region.

It is regarded as one of the worst weeds in Australia because of its invasiveness, potential for spread, and environmental and economic impacts.

Department of Environment and Natural Resources (DENR) Weed Branch Director, Nigel Weston, said Siam weed is a Class C (not to be introduced) weed in the Northern Territory.

“Siam weed is currently found in tropical Queensland and has the potential to spread across northern Australia and down the eastern and western coastline,” Mr Weston said.

“That’s why we are urging the public to be on the lookout and report and sightings to us by calling 89994567.

“Siam weed is a perennial plant that can out-compete and smother crops and native vegetation because of its phenomenal growth rate and ability to scramble up taller plants to a height of 20 metres.

“Vital industries such as agriculture and horticulture could be placed under severe threat if the weed spreads beyond control.

“Native to the Americas and now a serious weed in west Africa and tropical Asia, this is the first established infestation detected in the Northern Territory.

“Following the most recent detection south-west of Darwin we have notified the National Biosecurity Management Consultative Committee and are working closely with the landholders, as well as the Department of Primary Industry and Resources, to determine the full extent of the infestation and decide if eradication is a feasible target.

“Prevention and early intervention are the most cost-effective methods of weed control and we are working hard to ensure this outbreak is addressed strategically and rapidly.”

Anyone who thinks they have Siam weed on their property, or thinks they have seen it, is urged to contact the DENR Weed Management Branch on 89994567.

Siam weed

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