The Best Way to Control Small Hive Beetles: Heterorhabditis indica

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Biological Control of Small Hive Beetles

Small hive beetles are one of the most damaging pests facing honeybee colonies today. Once established, they can rapidly destroy comb, ferment honey, and cause colonies to abscond. Fortunately, biological control using beneficial nematodes (Heterorhabditis indica) offers an effective, environmentally friendly solution.

What Are Small Hive Beetles?

The small hive beetle (Aethina tumida) is an invasive pest that targets honeybee colonies. Adult beetles lay eggs inside the hive (Photo 1), where larvae tunnel through combs, feeding on honey, pollen, and brood. Once larvae mature, they leave the hive and burrow into surrounding soil to pupate. These mature larval stages in the soil are the most vulnerable point in their life cycle and the key target for biological control with Heterorhabditis indica nematodes.

Damage Caused by Small Hive Beetles

Small hive beetles cause damage in several ways:

• Comb destruction through larval tunneling
• Honey fermentation by a symbiotic yeast called Kodamaea ohmeri , making honey unmarketable
• Colony stress and collapse, often leading to absconding
• Contaminated equipment that attracts more beetles

Severe infestations can wipe out weak or stressed colonies in a short period of time.

The Role of Yeast in Honey Damage

Small hive beetles carry a symbiotic yeast called Kodamaea ohmeri (formerly Candida ohmeri). This yeast is introduced into hive honey by beetle larvae and adults. Once present, it:

• Ferments honey, producing a slimy, frothy texture
• Creates a rotting orange odor that repels bees
• Forces bees to abandon contaminated combs

This yeast-driven fermentation is one of the primary reasons small hive beetle infestations are so destructive.

Beneficial Nematodes as a Biological Control Solution

Heterorhabditis indica (Photo 2) is a species of beneficial entomopathogenic nematode that naturally controls soil-dwelling insect pests, including small hive beetles. These microscopic roundworms are completely harmless to honeybees, humans, pets, and plants.

How Heterorhabditis indica Kills Beetle Larvae and Pupae

Once applied to soil around beehives:

1. Nematodes actively seek out beetle larvae and pupae
2. They enter the insect through natural body openings like mouth, anus and breathing pores
3. Inside the host, they release their symbiotic bacteria (Photorhabdus spp.)
4. The bacteria multiply rapidly, killing the beetle larva or pupa within 24–48 hours
5. Nematodes reproduce inside the dead host and disperse to find new pests 

This process effectively interrupts the beetle life cycle before adults can return to the hive. For effective control of small hive beetles (Aethina tumida) using Heterorhabditis indica beneficial nematodes, timing, rate, and application method are critical because the nematodes only attack the beetle’s soil-dwelling stages.

When to Apply Heterorhabditis indica

Best Timing

Apply nematodes when beetle larvae are leaving the hive to pupate in the soil, which usually coincides with:

• Warm weather (soil temperatures ≥ 15–18°C / 60–65°F)
• Spring through early fall
• 1–3 weeks after adult beetles are first observed in hives

In warm regions with continuous beetle pressure, applications may be made every 4–6 weeks during peak beetle season.

Ideal Conditions

• Soil should be moist but not waterlogged
• Apply in early morning or evening to avoid UV exposure
• Irrigate lightly before and after application to help nematodes move into the soil

How Many H. indica Nematodes to Apply

Recommended Application Rate

For small hive beetle control:

• 2.5–5 million nematodes per 10 m² (100 sq ft)
  or
• 1–2.5 billion nematodes per acre

Per Hive Application (Common Beekeeper Practice)

• 250,000–500,000 nematodes per hive
• Apply to soil in a 2–3 ft (60–90 cm) radius around each hive
• Focus especially on the front and sides of the hive where larvae drop

How to Apply

1. Remove debris and weeds around the hive base
2. Pre-water soil so it is evenly moist for easy movements of nematodes in the soil
3. Mix nematodes in cool, chlorine-free water
4. Apply using:
   • Watering can (Photo 3)
   • Backpack or hose-end sprayer (remove fine filters)
5. Post-water lightly to wash nematodes into the top 2–5 cm of soil

How Often to Apply

• Single application: Light infestations
• Repeat every 4–6 weeks: Moderate to heavy infestations
• Reapply after heavy rainfall, soil disturbance, or hive relocation

Important Application Tips

• Do not apply to dry, compacted, or overheated soil
• Avoid chemical soil drenches before or after application
• Store nematodes refrigerated and use before expiration
• Do not expose nematodes to direct sunlight or hot water

Expected Results

• Beetle larvae and pupae begin dying within 24–72 hours
• Adult beetle populations decline over 2–3 weeks
• Best results occur when nematodes are combined with:
  • Hive traps
  • Strong colony management
  • Sanitation around apiaries

Conclusion

Beneficial nematodes such as Heterorhabditis indica provide beekeepers with a powerful biological tool to manage small hive beetles naturally. When combined with good hive management practices, nematodes help protect colonies, preserve honey quality, and support long-term apiary health.