foghornleghorn
Field Bee
Do you feed any pollen/sub?To increase hive numbers, I should be @ 100 odd hives 2 years ago, but I have been losing nearly 50% of hives for the last 3 years, I thought it was poor b/king on my part ! ...I have since found that other b/kers are in the same boat, which turns out to be poor mating ....
https://www.beeworks.com/slow-hives/ ...maybe ?
If it was just inbreeding you or other beekeepers would surely have sorted that fairly easily