Practical Guide: 3.1.2 Bee poisoning

Bee poisoning can cause significant colony losses and requires a rapid and structured response. This checklist describes the characteristic signs, possible causes, and steps to take if poisoning is suspected. The following information is based on the official checklist 3.1.2 of the Swiss Bee Health Service.

Official Practical Guide – Summary

Practical Guide: 3.1.2 Bee Poisoning

• Subject: Recognising colony poisoning and responding in accordance with official requirements.
• Characteristic signs:
  • Large numbers of dead or dying bees in front of the hive.
  • Abnormal behaviour (trembling, paralysis, inability to fly).
  • Simultaneous occurrence across multiple colonies.
• Possible causes:
  • Plant protection products used in agriculture or horticulture.
  • Improper use of chemical substances.
  • Accidental exposure to toxic substances.
• Management:
  • Do not alter the situation at the apiary.
  • Document observations precisely.
  • Notify the competent authorities in accordance with the official procedure.
• Important note:
  • Complete documentation is essential for any subsequent analysis.

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Summary compiled on the basis of Practical Guide 3.1.2. Last verified: 01/2026.

See also:

• Practical Guide: 3.1.1 Bee Poisoning Protocol Sheet
• The Bee as a Sentinel of Health and the Environment
• Neonicotinoids
• Why Abandon Pesticides?