Looking for advice, 5 frame nuc made with all the QC's from a large swarming hive, into their 3rd super. No signs of big varroa numbers in parent hive or nuc.
Checked nuc today lots of perfectly formed crawling bees and mesh floor covered in dead bees,tried under the microscope can't see anything obvious.
Parent hive still working. I've never seen or heard of Acarine in this area