New map reveals expanding Serrated Tussock risk across Victoria
The VSTWP has released the latest Serrated tussock Distribution Map (March 2026), providing the most up-to-date picture of where this invasive weed is occurring across the state.
The map shows that core infestations remain heavily concentrated around Melbourne, Geelong and the western districts, where serrated tussock has been present for many decades. However, the new data also reveals emerging infestations spreading further into regional Victoria, including the far west, North East Victoria, and parts of Gippsland around Maffra and Bairnsdale.
One of the most striking features of the updated map is the clear pattern of spread along major transport corridors. New infestations appear to follow major arterial roads extending from the Melbourne and Geelong region towards locations including Ballarat, Hamilton, Redesdale, Mia Mia, the Wimmera and the far North East.
According to VSTWP Chair Lance Jennison, the map highlights the importance of vigilance across the whole state.
“This new distribution map shows serrated tussock is continuing to move beyond its historic strongholds around Melbourne and Geelong,” Jennison said.
“We’re now seeing new infestations appear across parts of regional Victoria, which reinforces how easily this weed can spread if it isn’t detected early.”
Roadside infestations are of particular concern. Serrated tussock produces enormous quantities of seed that can be transported by wind, animals and machinery. Slashing equipment, road maintenance machinery and contractor vehicles can unknowingly carry seed long distances, allowing new infestations to establish far from their source. Agriculture Victoria continues to do an excellent job in managing isolated sites and ensuring landowners treat the infestations with the best practice each season. We thank them for their persistence.
“Road networks can act like highways for serrated tussock spread, particularly when seeds are moved on machinery or in contaminated soil,” Jennison said.
The VSTWP is encouraging landholders, contractors and community members to keep an eye out for the weed and report suspected infestations early.
“Early detection gives us the best chance of controlling new outbreaks before they become widespread problems,” Jennison said.
Landholders are encouraged to familiarise themselves with serrated tussock identification and management resources, which are available through the VSTWP website.
“If you think you’ve found serrated tussock, don’t ignore it — contact the VSTWP for advice and use the resources available on our website to help stop the spread,” Jennison said.
The March 2026 Serrated Tussock Distribution Map is an important tool for land managers, helping identify emerging risk areas and guiding coordinated control efforts across Victoria.
