Bee Health & Disease Management in Australia

Varroa destructor was detected in Australia for the first time in June 2022, when infested hives were found in Newcastle, NSW. An emergency eradication response was launched, but by late 2023 — after the mite had spread too widely for eradication to remain feasible — the NSW Department of Primary Industries officially transitioned from eradication to varroa management mode. Varroa has since spread into Queensland and is expected to continue expanding its range across beekeeping regions of eastern Australia.

Varroa mite is a parasitic mite that reproduces in honey bee brood cells, feeding on developing bees and transmitting viruses — most significantly deformed wing virus (DWV), which causes bees to emerge with crumpled, useless wings and dramatically shortened lifespans. An unmanaged varroa infestation will typically kill an untreated colony within 1 to 3 years. The economic and environmental impact on Australian beekeeping — both commercial and hobby — is substantial, and the impact on feral honey bee populations (which cannot be treated) will be significant for pollination ecosystems across the country.

What this means practically for Australian beekeepers:

• Monitoring is now mandatory in varroa-affected areas. Conduct an alcohol wash count (a 300-bee sample agitated in 70% isopropyl alcohol, with the mite count expressed per 100 bees) at least every 6 to 8 weeks during the active season. An alcohol wash count above 2 mites per 100 bees triggers treatment in most Australian guidelines.
• Treatment is now part of the management calendar. Approved varroa treatments in Australia include oxalic acid vaporisation (the lowest-residue option, approved for use and the most recommended for honey producers), synthetic miticides including tau-fluvalinate strips (Apistan), amitraz strips (Apivar), and others. All treatments have withholding periods; consult your state's current approved product list for current approvals, as the list is actively evolving.
• Treatment timing matters. Oxalic acid vaporisation is most effective when there is no capped brood in the hive (winter or after an artificial brood break), because the mite is only susceptible when on adult bees, not when protected inside capped brood cells. Strip treatments (Apivar, Apistan) can be used with brood present but must be removed after the specified treatment period and cannot remain in the hive during a honey flow.
• Resistance management. Rotate between chemical classes — do not use the same miticide in consecutive treatments. Apistan resistance has been documented in many overseas bee populations after years of sole reliance on tau-fluvalinate; avoiding this in Australia requires using multiple approved products.

Keep detailed treatment records. Your state agriculture department may request evidence of your varroa management program, and accurate records protect you in the event of a compliance inspection or hive movement request.

American foulbrood (AFB), caused by the spore-forming bacterium Paenibacillus larvae, is the most serious and devastating bacterial disease of honey bees and is present in Australia. It is a notifiable disease in all states and territories — which means that if you find or suspect AFB in your hive, you have a legal obligation to report it to your state agriculture authority immediately.

AFB kills bee larvae and pupae in capped brood cells. The characteristic signs that distinguish it from other brood abnormalities are:

• Sunken, perforated, or discoloured cappings — affected cells have cappings that appear darker than surrounding healthy cells, often slightly sunken or with a pinhole
• The "ropiness test" — insert a matchstick or toothpick into a suspect cell and slowly withdraw it. AFB-infected cells produce a brown, stringy, ropy thread that stretches 2 to 3 centimetres before breaking. This is the most reliable field test.
• A distinctive foul smell — often described as rotting meat. Healthy brood has a mild yeasty-sweet smell; AFB brood smells unambiguously rotten.
• Scale — as the disease progresses, the remains dry into a dark, hard scale on the lower cell wall that is very difficult to remove and serves as the primary source of re-infection in equipment.

There is no approved treatment for AFB in Australia — unlike some overseas jurisdictions where antibiotics have historically been used (and where antibiotic resistance in AFB spores is now a major problem), Australian biosecurity rules do not permit antibiotic treatment. Hives diagnosed with AFB must be destroyed by burning — all frames, bees, and organic material are burned, with the hive boxes treated or burned depending on the severity. This is devastating for the beekeeper but essential to prevent spread through the wider apiary environment. AFB spores survive in wax and equipment for decades; equipment from an AFB hive that is not properly decontaminated will infect future colonies.

Never move frames, equipment, or honey between hives without cleaning tools between hives. Robbing behaviour — where bees from one hive steal honey from a weakened neighbouring hive — is a primary transmission route for AFB. Keep hives strong and entrances appropriately reduced in dearth periods to minimise robbing risk.

The small hive beetle (Aethina tumida), originating from sub-Saharan Africa and first detected in Australia in 2002, is now firmly established across most of eastern Australia from Cape York to the NSW-Victoria border, with isolated populations further south. It is present in most Australian apiaries and represents a year-round management consideration, particularly in warm, humid coastal areas.

Adult small hive beetles are small (5 to 7 mm), dark brown to black, oval beetles that live and reproduce in bee hives. The beetles lay eggs in cracks and crevices in the hive; larvae hatch and tunnel through honey and pollen stores, defecating as they go and causing fermentation and "sliming" of honey stores. A severe beetle infestation in a weak colony can render the entire honey store unusable within days. Beetle larvae eventually exit the hive and pupate in soil outside — which is why the area surrounding your hive is relevant to beetle management.

Management strategies include:

• Keep colonies strong. A strong colony polices small hive beetles actively, confining them to corners of the hive and preventing reproduction. The most beetle-resistant hive is a populous, healthy colony — weak or queenless hives are most vulnerable to beetle damage.
• Beetle traps. Several commercially available beetle traps fit between frames or on the bottom board, luring beetles with vegetable oil or commercial attractants. They reduce beetle populations but do not eliminate them.
• Soil treatment. Applying food-grade diatomaceous earth around the base of the hive stand kills pupating beetle larvae emerging from the soil. Do not apply near the hive entrance — diatomaceous earth harms bees on contact.
• Hive positioning. Full sun on the hive stand area reduces soil moisture and makes it less suitable for beetle pupation. Avoid positioning hives on heavy, damp soil.

European foulbrood (EFB), caused by the bacterium Melissococcus plutonius, is less severe than American foulbrood but still causes significant brood losses, particularly in spring when colony populations are building rapidly and nutritional stress is high. Unlike AFB, EFB kills larvae before capping — affected larvae are yellow to brown, twisted in their cells, and have a slightly sour rather than rotten smell. The ropiness test is negative (the affected cells are liquid, not ropy). EFB is also notifiable in most Australian states.

EFB is associated with periods of nutritional stress — spring conditions where nectar flows are intermittent and pollen is adequate but not abundant. Strong colonies on good floral resources typically recover from mild EFB without treatment. Where colonies are repeatedly affected, addressing the nutritional environment (providing supplementary pollen substitute, ensuring hives are not positioned in areas with extended spring dearth) is more effective than focusing solely on the disease itself.

Sacbrood virus is a common and widespread brood disease caused by a virus that prevents pupae from completing their moult — affected pupae die inside their cell wall (the "sac"), giving the cell the appearance of a small liquid-filled bag under the capping. Sacbrood is generally self-limiting in strong colonies — bees identify and remove infected cells effectively — and rarely causes significant colony losses on its own. No treatment is available or needed in most cases; ensure the colony remains strong and queenright.

Beekeeping in Australia is regulated at the state and territory level, and requirements vary somewhat between jurisdictions. However, the following requirements apply in all states:

• Hive registration: All hives must be registered with the relevant state authority. Registration is free or low-cost and provides your registered beekeeper number, which must be marked on all hive boxes. Operate without registration at your legal and financial risk — unregistered hives cannot receive state biosecurity support and owners are liable for costs associated with unregistered hive disease events.
• Hive marking: All hive boxes (not frames) must be permanently marked with your registered beekeeper number. Marking is typically done with a branding iron or routered number plate on each super and brood box.
• Movement declarations: Moving hives between properties (particularly between Local Land Services regions in NSW, or between quarantine zones in varroa-affected areas) requires movement declarations and, in varroa management zones, may require testing or treatment certification before movement is permitted. Check current movement requirements with your state authority before moving any hives — varroa zone boundaries and movement rules are actively changing.
• Notifiable disease reporting: American foulbrood and European foulbrood are notifiable diseases in all states. If you find or suspect either disease, you must report it to your state agriculture authority promptly. Your state biosecurity officer will advise on required response actions.
• Treatment records: Maintain written records of all treatments applied to your hives — product, batch number, date, hive treated, withholding period. These records may be requested during compliance inspections and are essential for your own honey quality management.

State beekeeping associations are the most reliable source of current, jurisdiction-specific advice on registration processes, movement requirements, and varroa management zone rules. Join your state association — the annual membership fee is minor compared to the value of the information network, the equipment discounts, the extracting equipment access, and the local expertise available through fellow members.