Polyphagous Shot-Hole Borer Industry Update 2 December 2025

The Department of Primary Industries and Regional Development (DPIRD) is currently responding to a confirmed detection of polyphagous shot-hole borer (PSHB) in an avocado orchard in the suburb of Carabooda, within the Containment Zone of the Quarantine Area.

The pest was identified through DPIRD’s targeted surveillance program, which is a key component of the national Transition to Management (T2M) strategy. DPIRD is prioritising inspections and surveillance in the surrounding area to assess the presence and distribution of the pest.

The detection does not impact the movement of avocados or other fruit crops, which are not a carrier of shot-hole borer.

DPIRD is working closely with the affected landholder on next steps to manage the infested trees. The removal or pruning of shot-hole borer infested trees in the Containment Zone will be undertaken by DPIRD on a case-by-case basis.

To support the T2M, a dedicated Capacity Building and Training team has been established to provide practical support, training and resources to build long-term capability and resilience within industry, local government and communities.

The team is working with the horticultural industry to provide advice and ensure they have the latest tools and knowledge to manage the borer. For more information and to access training and resources, please contact the CB&T team via email at PSHB.CBTManager@dpird.wa.gov.au.

Overseas experience suggests that PSHB damage to avocado trees can be mitigated through proper cultural and pruning practices. It is recommended that commercial growers:

• Maintain regular monitoring within their orchards

• Practice good orchard hygiene

• Adhere to movement restrictions on wood and green waste

• Report suspect PSHB observations via DPIRD’s MyPestGuide® Reporter app or to the Pest and Disease Information Service at padis@dpird.wa.gov.au or (08) 9368 3080.

Early detection is critical within the Containment Zone and industry and community cooperation is essential to help prevent the spread of pest to the rest of the State.