Practical Guide: 2.7.1 Asian hornet (Vespa velutina): Instructions for an entrance protected by a grid

The flight hole protected by a grid is a protective measure designed to reduce predation by Asian hornets in front of colonies. This adaptation allows bees to move around normally while limiting access to predators. The following information is based on the official checklist 2.7.1 of the Swiss Bee Health Service.

Official Practical Guide – Summary

Practical Guide: 2.7.1 Instructions for Protected Hive Entrance with Grid

• Objective: Protect colonies against the Asian hornet by modifying the hive entrance.
• Principle:
  • Installing a grid in front of the hive entrance.
  • Maintaining passage for bees.
  • Restricting access for larger predators.
• Installation:
  • Use of a grid conforming to the recommendations.
  • Correct attachment without impeding flight activity.
  • Regular inspection of condition and cleanliness.
• Use:
  • When the presence of the Asian hornet has been confirmed.
  • As a complement to monitoring and reporting measures.
• Important note:
  • The protective grid does not replace other official measures.

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Summary compiled on the basis of Practical Guide 2.7.1. Last verified: 01/2026.

See also:

• Practical Guide: 2.7 Asian Hornet
• Vespa velutina, Asian hornet
• The Asian hornet arrives in Switzerland
• Asian hornet: a little biology…
• Practical Guide: 2.7.2 Nest Search by Triangulation