The books / Pests, Predators and Robbing / chapter 12 of 14

Mice in October

All chapters
  1. The dangerous weeks
  2. What a dearth looks like from the hive
  3. How robbing starts
  4. The beekeeper rings the bell
  5. Recognising it
  6. The entrance reducer
  7. The robbing screen
  8. When it is already bad
  9. Wasps through the year
  10. Strong colonies repel, weak ones fall
  11. The trap that works is the spring one
  12. Mice in October
  13. Bears
  14. Leaving them alone

A mouse looking for winter shelter is drawn to exactly the thing a broodless winter cluster offers: a warm, quiet, food-rich box that nothing is actively patrolling. Once inside, a mouse builds a nest in the lower box through the coldest months, shredding comb and frames for material and stressing a cluster that has no way to evict it until spring.

The fix is a metal strip with holes small enough to keep mice out but large enough for bees to pass, and the timing is simple to remember: put it on the same day you do your colony's last fall feeding, so there is no gap where the entrance is briefly memorable to a mouse looking for a home.