A few days ago I asked here what I should do with those holes in my gypsum wall that filled with parasitic wasps or bees.

I covered the unoccupied holes with gypsum, and left the sealed ones as is. There are plugs in there, so they can’t act as alternative tunnel holes.

Today I noticed a young wasp hatching!

I put some masking tape on the now open hole after I didn’t see it returning to it. If there’s something in there, it can bite through the tape and escape, but no others can enter.