Could be ants or they may have walked back in. Hopefully it's the ants.I've posted elsewhere that I had a few varroa on a couple of boards. When I checked the next day, they had gone !
Lots of ant activity so I wonder if they are taking them away?
I don't have sticky boards
Had you have used lactic acid spray you would have killed perhaps as many as 90% of the mites in the hive.I did a count a few days ago on a queenless hive and got a count of 16 over 4 days. There was only about a quarter of a frame of capped brood left so decided to sugar dust. This gave a drop of 40 after 4 hours
Lots of icing sugar in the pantry but no lactic acid. I'll have to read up on lactic acid and perhaps add it to the store cupboard.Had you have used lactic acid spray you would have killed perhaps as many as 90% of the mites in the hive.