The Polyphagous Shot-Hole Borer (PSHB) is a tiny invasive beetle (Euwallacea fornicatus) that bores into trees and spreads a pathogenic fungus, which can cause decline in tree health and eventually tree death. The PSHB attacks a wide range of tree species and poses a significant threat to our urban canopy and natural environment.
The Western Australian Government, through the Department of Primary Industries and Regional Development (DPIRD), is leading a long-term management response to slow the spread of PSHB across the Perth metropolitan area.
The City of Swan is working closely with DPIRD and neighbouring local governments to support this response and help protect our urban canopy and natural environment.
Image courtesy of Department of Primary Industries and Regional Development.
State quarantine and local restrictions
The WA Government has established quarantine restrictions covering the Perth metropolitan area, including the City of Swan, to help slow the spread of PSHB. Movement of untreated wood, green waste, mulch and live plant material from within quarantine zones is restricted unless processed in an approved way.
City of Swan residents should be aware:
- The Perth metropolitan area is divided into quarantine zones to help manage PSHB spread
- Untreated wood and plant material may not be moved outside the quarantine area without proper containment and processing.
For more information on the quarantine area visit, DPIRD’s PSHB webpage.
What to look for
Signs of PSHB infestation include:
- Small round shot-hole entry/exit holes in tree trunks and branches
- Discolouration, wilting or dieback of branches
- Frass (sawdust-like material) or gumming around holes.
If you notice these symptoms in a tree, it may be infested with PSHB
What you can do to help slow the spread of PSHB
You can help protect trees and slow the spread of PSHB by:
- Not moving untreated wood, green waste, mulch or live plants with woody stems outside the quarantine area or between zones
- Securing and covering all loads when transporting wood or green waste
- Using approved City of Swan recycling centres for PSHB-related disposal
- Monitoring trees on your property for signs of infestation
- Reporting suspected PSHB to DPIRD using the MyPestGuide Reporter app
- Avoiding pruning or cutting affected trees unless advised to do so.
More information
For the latest updates, quarantine maps and technical guidance, visit DPIRD’s PSHB webpage.
For official advice about suspected infestations, always follow DPIRD guidance.