The Australian Walnut Industry Association represents the biosecurity interests of walnut producers and the industry. They are members of Plant Health Australia and signatories to the Emergency Plant Pest Response Deed. Their responsibilities include:

  • biosecurity planning and implementation at the national and farm levels
  • liaising with federal and state governments on trade issues
  • funding and supporting biosecurity initiatives
  • participating in national committees and response efforts in an emergency.

Industry overview

In 2018–19, the walnut industry was valued at $44 million (LVP), with exports valued at $17.9 million. In-shell production of 12,800 tonnes was produced from over 4,000 hectares or 1.2 million trees.

About 45 per cent of Australia’s walnut production is exported with greatest demand for in-shell walnuts in China, Turkey and Italy.

The Australian walnut industry operates in most states of Australia. Major walnut production areas are on the east coast of Tasmania; the Goulburn Valley near Shepparton; the Murray Irrigation Area near Kerang and Swan Hill in Victoria; the Riverina near Griffith in New South Wales; and Manjimup in Western Australia. The industry is predicted to grow to 14,000 tonnes (4,300 hectares) by 2021 as current growers expand their orchards and new growers enter the industry.

Australia is free from the major pests and diseases that affect walnuts overseas, and the Australian Walnut Industry Association prioritises biosecurity to maintain this status.
Biosecurity is included in the Australian Walnut Industry Strategic Blueprint 2030 and it is part of the industry development officer’s role. The industry website maintains a biosecurity section to raise awareness of biosecurity among growers, and a representative attends PHA meetings and Australian Government Biosecurity Roundtables.

In 2020, the Australian Walnut Industry Association participated in responses to pest incursions, and funded projects to establish an Emergency Plant Pest Response (EPPR) levy and an Owner Reimbursement Cost Framework for the walnut industry, available on the association and PHA websites. Consultation was undertaken on the EPPR levy and the industry is working through the requirements, with the aim of the levy being legislated in 2021.

Annual value of walnut production, 2007–19

Distribution of walnut production by state and territory, 2018–19 (based on LVP)


Tree nut IBPBiosecurity Plan for the Tree Nut Industry

Biosecurity planning provides a mechanism for the almond industry, government and other relevant stakeholders to assess current biosecurity practices and future biosecurity needs. Planning identifies procedures that can be put in place to reduce the chance of pests reaching our borders or minimise the impact if a pest incursion occurs.

 The Biosecurity Plan for the Tree Nut Industry outlines key threats to the industry, risk mitigation plans, identification and categorisation of exotic pests and contingency plans. For a copy, please contact PHA on 02 6215 7700 or email admin@phau.com.au.

Nuts PostcardPostcard

Promotional item to support the exotic plant pest hotline 1800 084 881.

Exotic pests (not in Australia)

The following is a list of high priority exotic pests of walnuts. These pests were identified during the development of the Biosecurity Plan for the Tree Nut Industry in consultation with industry, government and scientists. They have been assessed as high priority pests based on their potential to enter, establish, and spread in Australia (eg environmental factors, host range, vectors) and the cost to industry of control measures.

PHA has a range of fact sheets, contingency plans and diagnostic protocols relevant to these pests. Pest risk review documents are also available for some pests. Please contact PHA on 02 6215 7700 or email admin@phau.com.au for more information.

Endorsed National Diagnostic Protocols are available from the National Plant Biosecurity Diagnostic Network webpage.

Common name Scientific name EPPRD Category Fact sheet Contingency plan Diagnostic protocol
Brown-marmorated stink bug Halyomorpha halys FS FS FS CP
Gypsy moths Lymantria dispar and Lymantria mathura FS FS FS CP DP
Khapra beetle Trogoderma granarium 2 FS FS CP
Navel orangeworm Amyelois transitella 3 FS
Verticillium wilt Verticillium dahliae (exotic defoliating strains) 3 FS
Xylella fastidiosa Xylella fastidiosa including X. fastidiosa subsp. multiplex and pauca 2 FS FS FS FS FS FS CP CPDP

Other pests

The following is a list of documents for other exotic pests of walnuts. Please note that this is not a complete list of walnut pests: rather it includes pests for which documents exist in the Pest Information Document Database.

Some of the documents presented here are not  tailored to the walnut industry and are included for information only.

Common name Scientific name EPPRD Category Fact sheet Contingency plan Diagnostic protocol
Citrus longicorn beetle Anoplophora chinensis FS CP
European canker Neonectria ditissima FS FS
False codling moth Thaumatotibia leucotreta syn Cryptophlebia leucotreta 2 FS CP
Filbertworm Cydia latiferreana FS
Glassy-winged sharpshooter Homalodisca vitripennis FS FS FS FS FS FS FS CP CP
Gypsy moths Lymantria dispar and Lymantria mathura FS FS FS CP
Omnivorous leaf roller Platynota stultana FS
Orange tortrix Argyrotaenia citrana syn A. franciscana FS
Pacific spider mite Tetranychus pacificus FS
Strawberry spider mite Tetranychus turkestani FS
Texas root rot Phymatotrichopsis omnivora (syn Phymatotrichum omnivorum) 2 FS FS
Walnut husk fly Rhagoletis completa FS