A quarantine area around the whole of Perth has been extended to stop the spread of a tree-killing beetle.
Effective from Friday, the WA Department of Primary Industries has broadened a quarantine area, restricting the movement of plants.
Authorities are trying to get a handle on the destructive polyphagous shot-hole borer, which burrows into trees, making tiny holes.
The beetles have a symbiotic relationship with fungus; the fungus kills trees, and the beetles also cause structural damage.
