Practical Guide: 2.11. Sacbrood
The disease is caused by a virus. The pathogen can multiply both in adult bees and in the brood. In contrast to elongated larvae or prepupae, which may become diseased and die, no clinical symptoms are visible in infected adult bees, but their lifespan is reduced.
Official Practical Guide – Summary
Practical Guide: 2.11 Sacbrood
- Description: Sacbrood is a viral disease affecting bee larvae, primarily after capping.
- Characteristic signs:
- Dead larvae in a sac-like form.
- Liquid contents inside the larva.
- Irregular brood pattern.
- Contributing factors:
- Weakened colonies.
- Unfavourable climatic conditions.
- Environmental stress.
- Management:
- Strengthen the colony through good husbandry conditions.
- Minimise sources of stress.
- Monitor developments in accordance with official recommendations.
- Important note:
- Sacbrood is not subject to mandatory reporting and often resolves spontaneously.
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Summary compiled on the basis of Practical Guide 2.11. Last verified: 01/2026.
See also:
- Sacbrood
- Practical Guide: 2 Diseases and Pests
- Bee Health Guide
- Recognising Bee Diseases
- Practical Guide: 4.7.3 Recognising Healthy Colonies
- Practical Guide: 4.1 Hygiene
