New detection of Serrated Tussock on Western Hwy Dimboola – Westernmost site in Victoria

A significant new detection of serrated tussock has been made on the south side of the Western Highway Dimboola, adjacent to the GrainFlow grain receival centre. This site now marks the most westerly recorded occurrence of serrated tussock in Victoria, and alarmingly, it’s the closest known infestation to the South Australian border, where this invasive species has not yet been detected.

📍 Location: View approximate site on Google Maps

The mature plant, which had already produced seed, was discovered and positively identified by Michael Moerkerk from Agriculture Victoria’s Biosecurity team. The detection was shared at the recent Upper Wimmera Invasive Plants and Animals (IPA) meeting, where Brian Howlett (Biosecurity) promptly notified David Burgoyne, the representative from Regional Roads Victoria, to coordinate the necessary follow-up actions.

Why This Discovery Matters

Serrated tussock is a highly invasive weed that significantly degrades pastures, native ecosystems, and biodiversity. Its spread westward increases the risk of cross-border contamination and places additional pressure on land managers, especially in areas where the species has not yet become established.

This latest detection highlights the urgent need for:

• Increased surveillance and rapid response in high-risk areas in western Victoria.

• Ongoing education and awareness for landholders and road management authorities

• Cross-border collaboration to prevent the spread into South Australia

What You Can Do

• Be vigilant: Learn how to identify serrated tussock, especially in new areas

• Report suspected plants to Agriculture Victoria or your local biosecurity officer, in regions where serrated tussock is less common.

• Stay informed by subscribing to the tussock times at serratedtussock.com

The VSTWP continues to work closely with state authorities and local stakeholders to monitor, manage, and contain the spread of this weed.