Polyphagous Shot-Hole Borer (PSHB): What Perth Property Owners Need to Know
August 10, 2026
If you own trees in Perth, the Polyphagous Shot-Hole Borer (PSHB) should be on your radar. This tiny invasive beetle — smaller than a sesame seed — has affected trees across the metro area and has changed the way tree work needs to be done in our city.
What Is PSHB?
PSHB tunnels into trunks and branches and farms a fungus inside the tree. The fungus blocks the tree’s vascular system — effectively starving it — causing branch dieback and, in susceptible species, killing the tree entirely. It attacks hundreds of species, including Perth favourites like box elder maples, figs, coral trees and robinias.
What To Look For
- Tiny, perfectly round holes in the bark, about 1mm across
- Fine sawdust-like frass, sometimes in little “noodles”, at holes or around the base
- Staining, gumming or sugary weeping on the trunk
- Branches wilting or dying back for no obvious reason
Why You Shouldn’t DIY an Infested Tree
PSHB spreads through infested wood. Pruning an infested tree and moving the branches — to the verge, the tip, or a mate’s firewood pile — is exactly how the beetle reaches new suburbs. Infested trees need to be assessed, worked on and disposed of under proper biosecurity protocols.
Government-Panel Experience
All Trees Perth was appointed to the DPIRD panel for the control of PSHB in Perth — part of the select group of arborists trusted by the WA government to manage this pest. If you suspect PSHB on your property, we know exactly what to look for and what to do next.
Concerned about a tree? Visit our PSHB inspection service or call 0403 911 934.
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