Perth Scientists Race to Stop Tiny Tree-Killing Beetle

A tiny beetle that once threatened to wipe out Perth's tree canopy hasn't disappeared—but scientists are gaining ground in the fight to stop it.

The polyphagous shot-hole borer made headlines in 2021 when it forced the removal of beloved trees in Perth's Kings Park and Hyde Park. These beetles, barely bigger than a grain of rice, burrow into trees and spread deadly fungus that can kill even massive, century-old specimens.

Now, while bird flu captures public attention, researchers at Murdoch University are making real progress. They're studying Australia's only laboratory colony of shot-hole borers to understand what attracts and repels the pest.

Dr. Wei Xu and his team are examining tiny tunnels the beetles create in different types of wood. Their goal is simple but powerful: develop traps that can detect the beetles before they spread beyond Perth's quarantine zone.

Early detection could be the difference between containment and catastrophe. The beetles thrive in warm, humid conditions, meaning Australia's northern regions face the highest risk if the pest escapes.

Avocado farmers in Western Australia's south-west are on the front lines. The region produces more than half of Australia's avocados, and the soft wood of avocado trees makes them especially vulnerable. One orchard in Carabooda already detected the beetles in December.

Brad Rodgers, an avocado grower in Manjimup, says farmers are vigilantly checking their crops. The Department of Primary Industries is supporting them with information and management strategies.

The Bright Side

Despite fears that bird flu might pull resources away from the beetle response, the WA government confirms all surveillance and management programs remain fully operational. Quarantine controls, training, and research continue without interruption.

The laboratory work at Murdoch University represents hope for not just Perth, but forests and farms across the country. Understanding what attracts these beetles means scientists can build better monitoring systems and potentially stop infestations before they start.

The shift from attempted eradication to long-term management reflects a realistic, sustainable approach. Rather than declaring defeat, researchers and farmers are adapting their strategies and working together.

The beetles may still be crawling and flying through Perth's quarantine zone, but they're no longer an invisible threat—and scientists are building the tools to keep them contained.