This is an experiment. A tunnel at the entrance of the hive with toothbrush installed to brush their back as they squeeze through to get in to the hive.
I’m thinking that if we can help the bees to groom their back, it might help them fight Varroa at the entrance.
The device is basically a toothbrush holder with mesh bottom and a bottle to catch the fallen mites.
So far, they have no problem getting out from their hive, but when they come back, they seem a bit lost and they keep returning to the usual normally unblocked entrance.
Here’s a video of what it looks like…