Yesterday I was called to my out-apiary because of a swarm. It had settled in a tree right in front of the building where my elevated hives are kept. The swarm was about 10m up the tree; the hives are at a height of about 20m. There was no way to reach the swarm.
I looked at Hive F's removable floor again on Tuesday 9th May. I counted 24 Varroa mites which had fallen out of the colony. That's 8 per day. Will they survive?
UPDATE: I visited the hive on 12th May after dark. There were another 32 mites. I've counted 88 mites in 7.5 days, an average of about 12 per day. That's very high. This colony has been untreated for a couple of years but it was from a bought queen before that. I don't think much of its' ability to manage Varroa.
I put the a swarm from Helen into Hive F on the evening of 2nd May. I had a look at the entrance and the removable hive floor this morning.
The colony appears to be settling in well, despite the colder May weather. There is shed wax on the removable hive floor; there are bees coming and going. It appears that they've been building comb and orienting themselves to their new area. I didn't look for pollen, but I wouldn't expect to see it this soon anyway.
I collected a new swarm today from Helen, another low intervention bee keeper who has a Top Bar Hive near the John Radcliffe Hospital. She had kindly caught them in a skep with a sheet under it. Collecting it was simple: tie up the sheet and carry it all away.
The colony from which it comes has been untreated for 2 years. Before that it was intensively managed by a keeper in Wolvercote.
I have placed it in my out-apiary in a new Commercial brood box: Hive F. I'm using frames without foundation, with only the lolly stick guides.