Practical Guide: 1.4.1 Drone Brood Removal

Targeted drone brood removal is a practical measure for reducing the varroa population. It uses the different brood characteristics of drones to remove mites from the brood nest and interrupt their reproductive cycle. The following summary is based on the official Practical Guide 1.4.1 of the Swiss Bee Health Service.

Official Practical Guide (BGD / SSA) – Summary

Practical Guide: 1.4.1 Drone Brood Removal

• Mode of action: Varroa mites preferentially infest male brood (drones) because their development time is longer. By selectively removing this drone brood, a substantial part of the mite population is removed and varroa reproduction is reduced.
• Purpose: Complementary, not stand-alone measure for varroa control; particularly effective in combination with other varroa treatments.
• Procedure – Key steps:
  • Select the timing when drone brood is clearly present and well developed.
  • Locate and mark drone brood combs.
  • Cleanly cut out and remove the drone brood (e.g. into a separate box or disposal container).
  • Process/dispose of the removed drone brood so that mites cannot return to the colonies.
• Application notes:
  • Use drone brood removal exclusively for varroa reduction; not for breeding purposes if the objective is pure breeding.
  • Plan in combination with other varroa treatments (e.g. late summer/autumn treatment).
  • Ensure careful disposal of drone brood to prevent mite reinfestation.
• Effect & limits:
  • Drone brood removal temporarily reduces the varroa population.
  • It does not replace systematic varroa treatment but is useful as a complementary measure.

► PDF of the official practical guide (DE)

► Official overview of practical guides (bienen.ch)
Note: Section Operational concept and practical guides → 1.4.1 “Drone Brood Removal”.

Summary based on Practical Guide 1.4.1. Last review: 01/2026.

Learn more:

• Practical Guide 1.1 Varroa Concept
• Summer brood interruption for varroa control
• Brood break for varroa control
• Practical Guide 1.3.3 Sublimation of oxalic acid