Varroa mite

• Curved, pinhead-sized mite.
• Adult females are reddish-brown, flattened, oval-shaped with body 1–1.7mm long and 1.5–1.99mm wide.
• Adult males are yellowish, spherical, with body 0.75–0.98mm long and 0.70–0.88mm wide.
• May be seen on the thorax or nestled into abdominal folds of adult bees.
• Obligate parasites of honey bees and do not survive for long off a host.

To the casual observer, V. destructor and V. jacobsoni look almost identical. However, there are slight differences in size and shape between the 2 species. There are also genetic differences that enable diagnostic identification.

• Live wherever bee colonies are found.
• Asian honey bees (Apis cerana) have adapted to withstand varroa mite infestations and are their natural host.

Varroa mite has been found in much of Asia, Europe, the USA, South America and New Zealand.

Varroa destructor has been detected in Queensland. The varroa mite surveillance map displays the locations where beekeepers and government officers have reported varroa mite populations. We are working with industry to slow the spread of this species.

Varroa jacobsoni do not normally reproduce on European honey bees. However, they have been observed reproducing on European honey bees at some overseas locations. In Queensland, there has been no evidence to suggest V. jacobsoni has reproduced on European honey bees.

The movement of any of the following carriers could spread varroa mite across the country:

• bee
• swarm
• nest or hive of bees
• apiary appliance
• apiary product
• person (especially in their hair) or their personal protective equipment (e.g. bee hats, veils, suits, jackets).

Environmental

Varroa mite numbers build up over time, eventually killing honey bee nests and hives if appropriate management strategies are not applied.

Varroa mite can cause:

• scattered brood
• crippled and crawling honey bees
• impaired flight performance
• a lower rate of return to the colony after foraging
• a reduced lifespan
• significantly reduced weight of worker bees.

Colony symptoms, commonly called parasitic mite syndrome, include:

• abnormal brood pattern
• sunken and chewed cappings
• larvae slumped in the bottom or side of the cell.

This ultimately causes a reduction in managed and feral honey bee populations, supersedure of queen bees, and eventual colony breakdown and death.

Varroa mite can carry bee viruses, including exotic viruses like deformed wing virus. These viruses can be more devastating to bee colonies than the mite themselves.

Economic

• Potential to severely affect honey production.
• Potential to severely affect a wide range of pollination-reliant food crops and crops that support primary food production like:
  • apples
  • pears
  • berries
  • mangoes
  • avocadoes
  • cotton
  • macadamia.

Slowing the spread of varroa mite in Queensland will give industry time to learn and adopt the best ways to manage the pest.

Early detection is essential to manage varroa mite populations at appropriate mite threshold levels.

Management

• Monitor hives every month using the alcohol wash method and report the results using the Bee 123 form, even if no mites are found.
• Immediately report:
  • unexpected hive deaths
  • deformed bees
  • bees with parasites
  • poor brood patterns.
• Approved agricultural chemicals are available for use on a rotational basis in an integrated pest management regime.
• Find out more about managing varroa mite or email varroa@daf.qld.gov to speak to a varroa development officer.

Everyone in Queensland has a general biosecurity obligation (GBO) under the Biosecurity Act 2014 (the Act) to manage biosecurity risks. Under the Act, you must:

• report all sightings of varroa mite immediately to Biosecurity Queensland on 13 25 23
• take all reasonable and practical steps under your control to minimise any associated risks.

Both species of varroa mite are listed as prohibited matter under the Act.

Queensland is a varroa mite biosecurity zone.

If you are moving bees, beehives, used beekeeping equipment or bee products (including unprocessed honey) into Queensland from the ACT or states or territories where varroa mite has been found, you must:

• follow the movement control order
• hold a biosecurity instrument permit
• notify a Biosecurity Queensland inspector if you have moved any of these items from the ACT into Queensland from 1 September 2024 (email varroa@daf.qld.gov.au).

The Australian Government monitors cargo ships entering Australian ports for bees and other unwanted insect pests. If you find a swarm in an international airport or seaport, call 1800 798 636.