Specifically, how are they getting into the areas closed off by plastic caps? Like where the tool goes to open the frames.
Full disclosure I accidentally left the caps off when I put the flow frames on this year. So the ants got in. But then I scared them out and capped it off, expecting to return after a few days to scare out the stragglers, but instead there were a ton more behind the caps. I'm working on my measures to keep the ants from the hive in the first place, but I can't figure how they're getting behind those caps.