Australia Imposes Restrictions on Bacterial Pathogens in the Genus Xylella

Australia has reinforced pest risk controls for bacterial pathogens in the genus Xylella through updated pest risk analysis reports.

AUSTRALIA – PLANT BIOSECURITY

Australia Tightens Controls on Xylella Bacteria

Importers must manage plant material carrying these bacterial pathogens.

What changed

Pest risk controls reinforced for bacterial pathogens in the genus Xylella.

Strict import controls required for all products containing these pathogens.

Specific strains targeted including Xylella fastidiosa and Xylella pest.

Movement restrictions enforced on distribution of affected plant material.

Who it affects

Importers of plant material must comply with biosecurity restrictions for Xylella pathogens.

Distributors of plant products must control movement of material containing these bacteria.

Agricultural and horticultural operators must manage biosecurity risks from Xylella.

Australia — bacterial pathogen controls for Xylella genus

Regulation Analysis: Updated Pest Risk Controls for Xylella in Australia

Australia has reinforced its biosecurity measures for bacterial pathogens in the genus Xylella through a finalised Pest Risk Analysis (PRA) report, which updates import conditions for host nursery stock, tissue cultures, and seeds. The changes reflect a transition from emergency measures to a phased implementation, with key requirements varying by risk classification (low-risk vs. high-risk countries/regions) and plant material type. Below is a structured breakdown of the updated controls.

1. Key Changes and Requirements

The PRA introduces differentiated import conditions based on:

Risk classification of the country/region (low-risk = Xylella not known to be present; high-risk = Xylella present or uncertain).
Plant material type (nursery stock, tissue cultures, seeds for sowing).

Comparison of Import Conditions

Plant Material	Low-Risk Country/Region	High-Risk Country/Region	Authority
Host nursery stock (excl. tissue culture)	Phytosanitary certification confirming production from Xylella-free mother plants^{1, 2}.	Mandatory laboratory testing and disease screening only at the Australian Government Post-Entry Quarantine (PEQ) facility to confirm freedom from Xylella².	Department of Agriculture, Fisheries and Forestry (DAFF)^{1, 2}.
Host tissue cultures	Phytosanitary certification confirming production from Xylella-free mother plants¹.	Strengthened requirements: – Mother plant testing (not tissue culture) for Xylella prior to establishing tissue culture lines². – Testing laboratories outside Australia must be DAFF-authorised². – Updated PCR test protocols and result interpretation^{1, 2}.	DAFF^{1, 2}.
Seeds for sowing (Carya spp.)	Not specified.	Mandatory laboratory testing and screening at PEQ, regardless of source location².	DAFF².

2. Additional Requirements for High-Risk Countries/Regions

For tissue cultures and nursery stock from high-risk areas, the PRA mandates:

Laboratory Testing:
- Replacement of one of the two PCR molecular tests for Xylella detection, with updated protocols for result interpretation^{1, 2}.
- Test reports must accompany phytosanitary certificates^{1, 2}.
Authorised Laboratories:
- Foreign laboratories conducting Xylella testing for exports to Australia must be authorised by DAFF².
Phytosanitary Certification:
- Must confirm compliance with all testing and production requirements^{1, 2}.

3. Implementation Timeline

Phased transition from emergency measures to the new PRA requirements begins on 20 January 2027 (revised from 20 October 2026)^{1, 2}.
Revised import conditions will be published in the Biosecurity Import Conditions system (BICON):

¹(https://bicon.agriculture.gov.au/BiconWeb4.0/)^{1, 2}.

4. Regulatory Context

The PRA updates reflect:
- A shift from family-level to genus-level regulation of plant hosts^{1, 2}.
- Incorporation of new scientific data on Xylella hosts, distribution, and diagnostic assays^{1, 2}.
The changes were finalised after public consultation and submissions¹.

Summary Answer

Australia’s updated Xylella import controls introduce risk-based requirements for nursery stock, tissue cultures, and seeds, with stricter measures for high-risk countries/regions. Key changes include:

Low-risk countries: Phytosanitary certification of Xylella-free mother plants^{1, 2}.
High-risk countries: Mandatory DAFF-authorised laboratory testing (for tissue cultures) or PEQ screening (for nursery stock/seeds), with updated PCR protocols and result interpretation^{1, 2}.
Implementation: Phased rollout begins 20 January 2027, with conditions published in BICON^{1, 2}.

All measures are enforced by the Department of Agriculture, Fisheries and Forestry (DAFF) under Australia’s biosecurity framework^{1, 2}.

Sources

↩ Final report for the pest risk analysis for bacterial pathogens in the genus Xylella — imrd / directdoc https://docs.wto.org/imrd/directdoc.asp?DDFDocuments/T/G/SPS/NAUS557A1C1.docx
↩ Final report for the pest risk analysis for bacterial pathogens in the genus Xylella — imrd / directdoc https://docs.wto.org/imrd/directdoc.asp?DDFDocuments/T/G/SPS/NAUS557A1.docx