SA Varroa update and information webinar

Escalating Bee Threat

Varroa mite, a parasitic pest that weakens and kills honey bee colonies, has invaded South Australia with alarming speed. First spotted in Pooginook in the Riverland in September 2025, it jumped to the Limestone Coast near Salt Creek by November 20, followed by confirmations at Taratap and Sellicks Hill on November 26. By February 20, 2026, infections affected 32 apiaries and 25 apiarists, with new hotspots in Baroota, Port Davis, Kuitpo, Wirrega, the Coorong, and Mount Gambier. This expansion, often without clear links, underscores the mite's mobility through bee swarms, shared equipment, and human transport.

The infestation hits hard at a time when Australia has abandoned national eradication efforts, opting instead for management since September 2023. In South Australia, movement controls lock down affected sites, while 25km surveillance zones mandate frequent hive checks. Beekeepers face immediate hive losses if untreated, plus ongoing expenses for acaricides like Bayvarol. Pollination-dependent crops, from almonds to fruits, stand to suffer reduced yields, potentially costing the economy hundreds of millions annually. The recent detection of pyrethroid resistance in northern New South Wales in January 2026 adds urgency, limiting effective treatments and raising fears of broader inefficacy.

Beyond the basics, tensions simmer between rapid containment and long-term viability. Some incursions lack identifiable sources, complicating traceback and fueling debates over border controls' adequacy. The South Australian Varroa Industry Advisory Committee coordinates responses, but beekeepers bear much of the monitoring and treatment burden, with government aid like free initial acaricides tapering off. Trade-offs emerge in miticide rotation to delay resistance, which demands precise application but risks incomplete control if mishandled. Meanwhile, the national transition program wrapped up in February 2026, leaving industries to adapt amid potential virus outbreaks tied to the mite.