On 22 June 2022, Australian beekeeping changed permanently. Varroa destructor — the most destructive honey bee parasite in the world and the primary driver of global colony losses over the past four decades — was detected for the first time in Australia at the Port of Newcastle in NSW. What followed was an 18-month emergency eradication effort that, despite destroying over 30,000 hives and spending tens of millions of dollars, ultimately could not contain the spread. In October 2023, NSW DPI officially transitioned from eradication to management mode, and Australia joined the rest of the world in managing varroa as an endemic pest rather than trying to eliminate it.

For Australian beekeepers, this is a fundamental change in the management landscape. For decades, Australia's varroa-free status was one of the defining advantages of beekeeping here — no varroa monitoring, no miticide treatments, no resistance management, and access to international markets that required varroa-free certification. That era is over. Every beekeeper keeping European honey bees in varroa-affected regions of Australia now needs to understand varroa biology, monitoring, treatment, and how to integrate varroa management into the annual beekeeping calendar.

What varroa mite is and how it affects bees

Varroa destructor is a parasitic mite that is visible to the naked eye — approximately 1.5 mm across, oval, and reddish-brown in colour. Adult female mites feed on the fat bodies of adult honey bees (attaching to the abdomen, particularly between abdominal segments) and reproduce exclusively inside capped honey bee brood cells, where they are protected from most treatment chemicals and from the bees' grooming behaviour.

The reproductive cycle: a foundress mite enters a brood cell just before capping, hides in the brood food at the base, and begins laying eggs after the cell is capped. In a worker cell (capped for approximately 12 days), a successful mite produces 1 to 2 reproductive females. In a drone cell (capped for approximately 15 days), the longer development period allows 2 to 3 reproductive females — which is why varroa preferentially reproduces in drone brood. The foundress and her reproductively mature daughters ride out on the emerging bee when the cell is uncapped, dispersing to other bees and eventually into other brood cells to repeat the cycle.

Direct physical damage from feeding is significant but not the primary cause of colony collapse. The greater damage is viral transmission: varroa mites are highly efficient vectors of multiple honey bee viruses, most critically deformed wing virus (DWV). A mite-infested larva that is fed on by a reproductive mite almost invariably develops elevated viral loads, and the bees that emerge from heavily infested brood frequently show deformed wings (crumpled, shrunken, unable to fly), markedly shortened adult lifespans (from 6 weeks to as little as 2 weeks), and impaired navigation and foraging ability. A colony with a growing varroa infestation effectively becomes a progressively more virus-diseased population, and the combined effects of mite feeding, viral load, and shortened worker lifespan will typically kill an untreated colony within 1 to 3 years of initial infestation.

Monitoring: the foundation of varroa management

You cannot manage what you cannot measure. Regular, consistent varroa monitoring is the foundation of effective varroa management — without a quantified mite count, any treatment decision is a guess, and treating unnecessarily accelerates resistance development while failing to treat when needed leads to colony collapse.

The alcohol wash is the most reliable and widely used monitoring method for Australian beekeepers. The method:

  1. Collect approximately 300 bees (roughly half a cup) from a brood frame into a sealed jar or purpose-built wash kit — do not include the queen. The sample should be from the brood nest where phoretic mites (mites riding on adult bees) are most concentrated.
  2. Add 70% isopropyl alcohol (rubbing alcohol) to the jar — enough to fully submerge the bees — and agitate vigorously for 60 seconds. The alcohol kills the bees and dislodges phoretic mites.
  3. Pour the contents through a fine mesh (the purpose-built kits have a double-mesh system) into a white container. The bees are retained on the mesh; the mites fall through into the white container where they are easy to count against the white background.
  4. Count the mites. Divide by the number of bees (estimate: count the bees retained on the mesh and calculate per 100 bees).

A count below 2 mites per 100 bees is generally acceptable. Between 2 and 4, increase monitoring frequency and prepare to treat. Above 4 per 100 bees, treat promptly. These thresholds are current Australian guidelines but may be updated as more local data accumulates — check your state authority for current thresholds.

The sticky board method — placing a sticky board under a mesh bottom board for 24 to 72 hours and counting mite fall — is another monitoring option. It is less accurate than the alcohol wash (mite fall counts vary with colony size, weather, and season) but provides a non-lethal assessment that some beekeepers prefer. Sticky board counts of more than 8 to 10 mites per 24 hours typically indicate a mite load requiring attention.

Approved treatments in Australia

Australia's approved varroa treatment products are listed by the Australian Pesticides and Veterinary Medicines Authority (APVMA) and vary by state — the approved product list is being actively updated as the varroa response evolves. The following products represent the major treatment categories as of mid-2026, but always verify current approvals with your state authority before purchasing or applying any treatment:

Oxalic acid vaporisation (OAV): Oxalic acid is a naturally occurring organic acid approved for varroa treatment via vaporisation in Australia. The acid is heated in a vaporiser unit inside the sealed hive, producing vapour that kills phoretic mites on adult bees. It does not penetrate capped brood cells and is therefore most effective when there is no capped brood in the hive — typically in winter (when the queen may stop laying and brood rearing pauses) or after an artificial brood break. For winter treatment of broodless colonies, a single vaporisation treatment is highly effective. For treatment with brood present, multiple treatments over consecutive weeks are required to catch mites emerging from successive capped cells.

Amitraz strips (Apivar): Plastic strips impregnated with amitraz, placed between frames in the brood area. Bees walking across the strips distribute the amitraz through the colony, killing phoretic mites. Apivar can be used with brood present and provides a longer-acting treatment (typically 6 to 8 weeks) that catches multiple mite reproductive cycles. It must be removed after the specified treatment period and cannot remain in the hive during honey production. Amitraz resistance has been documented in varroa populations overseas; using Apivar in rotation with other chemical classes (not exclusively) is essential for resistance management.

Tau-fluvalinate strips (Apistan): A synthetic pyrethroid in strip form, with the same general application approach as Apivar. Apistan resistance is widespread in varroa populations in Europe and North America where it has been used heavily — do not rely on Apistan as a sole treatment option. It remains in the approved product list but should be used in rotation.

Formic acid products (MAQS, Formic Pro): Formic acid in a pad or gel form placed on top of the brood frames. The acid vapour penetrates capped brood cells, making formic acid the only treatment currently able to kill mites within the cell during reproduction. This is a significant advantage but comes with limitations: formic acid is temperature-sensitive (most products have temperature windows of 10 to 29°C for application), requires adequate ventilation, and can cause queen loss if applied incorrectly or in extreme heat. Approval status in Australia — check current APVMA listings.

Treatment timing and the annual calendar

In a varroa management program, treatment timing is as important as treatment choice. The two key treatment windows in the Australian annual cycle are:

Autumn (March–May): After honey extraction and before winter, this is typically when mite loads are at their seasonal peak — a full summer of mite reproduction without treatment will have built population levels that need addressing before winter. Treating in autumn with a strip product (Apivar) while brood is still present, or with formic acid, reduces the mite population entering winter and protects the long-lived winter bees that carry the colony through to spring buildup. These winter bees are the most critical workers in the colony — heavily infested winter bees are shorter-lived and the colony may not survive to spring.

Winter (June–August): If a broodless or near-broodless period occurs in winter (which varies by climate — some Australian regions have no true broodless period), oxalic acid vaporisation during this window provides the most efficient treatment available. A single treatment of a fully broodless colony can reduce mite loads by over 90% — far more effective than any treatment applied with brood present.

A minimum treatment program in varroa-affected areas is one autumn strip treatment and one winter OAV treatment. Higher mite pressure areas or more productive hives may require additional mid-season monitoring and a spring treatment before the honey flow if mite counts are elevated. The goal is to keep mite loads consistently below the treatment threshold through the year, not to treat reactively only when colony collapse is imminent.

Varroa-tolerant bee genetics: the long-term strategy

Chemical treatment manages varroa but does not solve it — the long-term sustainable strategy for Australian beekeeping is developing bee populations with natural behavioural resistance that reduces treatment frequency. Three genetic approaches are relevant in the current Australian environment:

Russian bee genetics: As discussed in our bee types guide, Russian bees from the Primorsky region have decades of co-evolutionary history with varroa and show measurably better natural mite resistance through increased hygienic behaviour, brood-break behaviour during dearth, and grooming. Well-selected Russian-line bees can maintain acceptable mite loads with 30 to 70% fewer treatments than susceptible European races.

Varroa-sensitive hygiene (VSH): A specific behavioural trait — the ability to detect and remove varroa-infested pupae from brood cells — that has been selectively bred into specific Carniolan and Italian lines. VSH-selected queens are available from some Australian breeders and are compatible with standard beekeeping management, unlike some more extreme varroa-resistant genetics that come with management challenges.

Locally adapted queens: Over time, queen breeders who select for both production and varroa tolerance in Australian conditions will develop genetics specifically suited to our climate and forage resources. Supporting Australian queen breeders who are doing this work — rather than always importing queens — builds the long-term genetic base for sustainable Australian beekeeping.

The varroa management zone system

In NSW (and likely in other states as varroa spreads), the state authority has established varroa management zones with different regulatory requirements based on mite establishment status:

  • Eradication zone: Areas where varroa has been newly detected and eradication may still be feasible. Strict movement restrictions, mandatory treatment, and hive destruction may apply.
  • Transition zone: Areas transitioning from eradication to management — beekeepers can keep and treat their hives but must follow specific management protocols and movement restrictions.
  • Management zone: Areas where varroa is established and management rather than eradication is the objective. Beekeepers must register, monitor, and treat; movement of hives is permitted with appropriate declarations.

Zone boundaries change as varroa spreads and management responses evolve. Check the current zone map through your state agriculture department website regularly — particularly before moving hives between properties, which may cross zone boundaries and trigger different movement requirements.

Varroa management guidelines, approved treatment products, and zone boundaries in Australia are changing rapidly. This guide reflects the situation as of mid-2026. Always verify current requirements with your state department of agriculture or beekeeping association before making management decisions.

For more, see our Beekeeping in Australia for Beginners: Your Complete Getting Started Guide and Beef Cattle Breeds in Australia: Choosing the Right Breed for Your Property.