Pest Expedition Bears Fruit For Bio And Food Security

With the Oriental fruit fly last detected on mainland Australia along the North Queensland coast in 1995, the risk of another incursion remains a serious threat to the Burdekin's fruit industry. The pest, which thrives in climates similar to our own, could devastate key crops such as bananas and mangoes—staples of both local farms and the broader Australian horticultural sector. With Burdekin and surrounding regions heavily reliant on these industries, another outbreak could have dire economic and environmental consequences.

A joint PNG-Australia expedition visited remote Treaty Villages in PNG’s Western Province last week to discuss and help manage one of the world’s worst horticultural pests. With just 6km separating the two countries, the project seeks to reduce the impact of fruit fly in PNG while also preventing a potentially catastrophic outbreak in North Queensland.

The last time the pest was detected on the Australian mainland, not far from Cairns, the eradication effort cost at least $33 million, with a further $100 million lost in trade and associated expenses. A future outbreak could have severe consequences for Queensland growers, making prevention a top priority.

Deputy Secretary of Biosecurity Justine Saunders said the project was critical for both countries.

“We already have Queensland fruit fly, but Oriental fruit fly would be much worse in terms of impact to production and trade, as recognised by its listing on Australia’s National Priority Plant Pest List," Ms Saunders said.

“This trip established foundational relationships with the village communities, which the team hopes to strengthen further on a return trip in May 2025. The next phase is to trial control strategies in the hope of reducing the number of fruit flies in the Treaty Villages to assist our neighbours with food security.

“The program has employed and trained more than 30 South Fly rangers since 2022 to trap the insects, collect samples and manage data. It builds on more than two decades of collaboration in plant health initiatives between DAFF and NAQIA. The results of this work could have benefits to share across PNG and with our neighbours in the Pacific.”

The Oriental fruit fly (Bactrocera dorsalis) attacks more than 400 different plants, including key crops in North Queensland such as mangoes, pawpaws, bananas, and guavas.

The villages of Berr, Buzi, Jarai, and Mari, where the trial is proposed, rely heavily on the food they grow. Damage to crops has serious health and social implications for villagers. At the same time, stopping the pest at its source is vital to preventing another outbreak in Australia.

The delegation consisted of three officers from PNG’s National Agriculture and Quarantine Inspection Authority (NAQIA), three from DAFF, a PhD student, delivery partner INLOC, and the South Fly rangers.

INLOC and the South Fly rangers coordinated the trip’s logistics, which involved liaising with Treaty Village leaders and community members, long boat rides, camping, and unpredictable tides.

With so much at stake, the work being done in PNG is not just about protecting their crops—it’s also a frontline defence for North Queensland’s fruit growers.

A joint PNG-Australia team visited remote Treaty Villages in PNG’s Western Province to discuss strategies for managing the Oriental fruit fly, a serious threat to horticulture in both countries. Photo credit: Darrol Williams

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