The small hive beetle (Aethina tumida) is a serious pest that can devastate healthy bee colonies in days. Native to sub-Saharan Africa, SHB has spread across Australia since 2002, especially in warm, humid regions from Victoria to North Queensland. Its larvae feed on brood, pollen, and honey, contaminating the hive with fermenting yeast and causing rapid collapse, known as a “slime-out.”
To prevent SHB infestations, beekeepers should stay vigilant—especially during summer when temperatures exceed 30°C and humidity hits 70%. Key strategies include:
• Maintaining strong colonies with productive queens
• Combining weak hives or boosting them with capped brood
• Removing excess comb and sealing hive gaps
• Using slotted bases with dry diatomaceous earth or lime
• Practicing careful re-queening and good apiary hygiene
• Avoiding infested equipment and combs
• Using blue chux cloth traps and affordable beetle baits
• Placing hive legs in oil cups to block beetles and ants
• Spreading used coffee grounds to deter breeding
With proactive care, beekeepers can safeguard their hives and support thriving bee populations.
Varroa mite (Varroa destructor) is a deadly parasite that weakens honey bee colonies by feeding on adult bees and developing brood. It spreads viruses, disrupts hive behavior, and can lead to total colony collapse if left untreated. First detected in NSW in 2022, eradication was deemed unfeasible by 2023, and Australia has since shifted to a management approach.
To report suspected infestations in NSW, call the Exotic Plant Pest Hotline at 1800 084 881. Even uncertain sightings should be reported.
Prevention tips:
• Regularly inspect hives for mites and signs of stress
• Avoid sharing equipment between colonies
• Maintain strong, hygienic colonies with good ventilation
• Use screened bottom boards and drone brood removal
Treatment options:
• Apply Integrated Pest Management (IPM) strategies
• Use approved miticides carefully to avoid residue in honey
• Consider natural remedies like essential oils under expert guidance
By staying alert and proactive, beekeepers can reduce the impact of Varroa mite and protect pollination and honey production across NSW.
American foulbrood (AFB) is a highly contagious and deadly bacterial disease that affects honey bee brood. Caused by Paenibacillus larvae, AFB spreads when young larvae ingest spores that germinate in their gut, leading to death at the pre-pupal or pupal stage. Early detection is critical, as the disease can devastate entire colonies.
Beekeepers should inspect brood combs at least twice a year—ideally in spring and autumn—though AFB can strike at any time. Signs include sunken, greasy, and perforated cappings, irregular brood patterns, and discolored larvae turning from white to brown. The “ropiness test” is a key diagnostic tool: inserting a matchstick into a diseased cell and pulling out a sticky thread confirms infection. Over time, infected brood dries into a dark scale that clings to the cell wall.
AFB spreads through contaminated hive components, infected honey or pollen, robbing behavior, and drifting bees. Spores are especially dangerous to larvae under 24 hours old and can remain viable for over 50 years. To prevent outbreaks, beekeepers should replace brood combs every 3–4 years, sanitize tools between inspections, and implement barrier management systems. If AFB is confirmed, report it immediately, destroy the infected colony, and burn or irradiate contaminated equipment to halt further spread.
Chalkbrood is a fungal disease in honey bee colonies caused by Ascosphaera apis. It affects larvae when they ingest fungal spores during feeding. These spores germinate in the gut, leading to starvation and death. The disease is widespread across Australia and tends to flare up during cool, wet weather or when colonies face nutritional stress—especially in spring when brood expansion outpaces the adult bee population’s ability to regulate nest temperature.
Symptoms include a scattered brood pattern, perforated cappings, and the presence of chalk-like “mummies”—dehydrated larvae that turn white-grey as the fungus matures. Bees often remove these mummies, depositing them at the hive entrance or on the ground. Chalkbrood spreads easily through drifting or robbing bees, contaminated equipment, pollen, and water. Spores can remain viable for up to 15 years.
To manage chalkbrood, beekeepers should replace infected combs and regularly clean hive entrances and bottom boards. Position hives in dry, sunny, well-ventilated areas to discourage fungal growth. Replacing the queen with one from a hygienic stock—known for removing diseased brood—can significantly reduce disease impact. Choosing bees with strong hygienic behavior is a proactive step toward maintaining healthy, productive colonies and minimizing chalkbrood outbreaks.
European foulbrood (EFB) is a serious bacterial disease affecting honey bee brood, caused by Melissococcus plutonius. Larvae become infected after consuming contaminated food, and the bacteria multiply in their gut, competing for nutrients and ultimately causing death by starvation. EFB outbreaks are more common during spring, especially in cool, wet conditions or when colonies suffer from poor nutrition and stress.
To detect EFB early, beekeepers should inspect brood combs thoroughly in spring and autumn. Look for irregular brood patterns, mottled appearances, and larvae that die in twisted or coiled positions. Infected larvae change color from pearly white to yellow, then brown. Most die before their cells are capped, so focus on unsealed brood. The ropiness test—drawing out semi-fluid remains with a matchstick—can help confirm infection. A strong ammonia-like odor may also be present in older dead brood.
EFB spreads easily through contaminated hive components, infected honey or pollen, robbing behavior, and drifting bees. Spores can remain viable for years. To prevent reinfection, maintain strong colonies with young, healthy queens, replace brood combs every 3–4 years, and implement a barrier management system. Always disinfect hive tools and equipment between inspections to reduce the risk of spreading EFB across apiaries.
Nosemosis, also known as nosema disease, is a common honey bee infection caused by two microsporidian parasites: Nosema apis and Nosema ceranae. These spore-forming fungi affect worker bees, drones, and queens, spreading through contaminated food, water, or hive cleaning. Once ingested, the spores germinate in the bee’s mid-gut, leading to reduced lifespan, weakened colony health, and poor overall performance.
Nosema apis typically causes symptoms like dysentery, crawling bees with swollen, greasy abdomens, dislocated wings, and reduced egg-laying by the queen. Colonies may suffer rapid decline and heavy winter losses. Nosema ceranae presents similar signs but usually without dysentery or crawling behavior, and it thrives in warmer climates. Symptoms are more noticeable during cooler seasons—especially autumn and spring—when nutrition is poor and weather is damp.
Beekeepers should monitor colonies for declining populations, poor honey and brood production, and visible signs of infection. Nosema spores spread quickly through contaminated equipment, drifting bees, and hive waste. To prevent outbreaks, maintain strong colonies with young queens, rotate combs every 3–4 years, and place hives in sunny, well-ventilated areas. Regular decontamination of hive tools and equipment is essential to stop the spread and protect colony health year-round.