I use screened bottom boards and haven't medicated more than pollen patties, SW and Mega Bee (which I just started this spring).
A brief description of the early and mid spring weather here in the high plains just SE of Denver CO: multiple times we had days of warm and sunny in the 60's and 70's, followed by a sharp decline in temp and days of rain and snow and harsh winds. I realize now that I will be building wind breaks around my 2 year old apiary this summer. I'm sure this played a roll in the reduction of hive strength and activity I could witness out in front of the hives. Two hives now have no activity.
Upon examination today, I found a large pile of dead carcasses in the rear of both hives. Most of the carcasses had hollowed out heads.
I have ordered two packages of bees to replace the dead colonies
My question: Is there any advice one might give, in what type of prep work is necessary before I put bees back in the hives.
I appreciate any time offered to my question. Thank you.