@Laura2592 We get mosquitoes around here, too, but since folks aren't spending much time outside, here, like they would if there was a back yard available, it's never been an issue for guests.
We also have ant season, but they seldom get inside. I had a few in the house this spring due to it having been so dry - I think they were looking for water.
Occasionally, a small (and I mean small - as in a couple of millimeters) spider will take up residence in the guest space. I do a pre-check for those prior to guest arrival. Of course, that doesn't mean one won't come in during a stay.
The one time I had a complaint about that (it was a very high maintenance guest in so many ways, and I missed all the red flags) CS was totally unsympathetic. Guest cancelled after one night, after spending the night with said scary arachnid, but never asked me to come in and get it. They arrived very late - so I figured they weren't happy with the space for other reasons, and poor "Spid" was the sorry excuse.
When I first started hosting, I had a fear that someone would track bedbugs in, especially after staying in one of our large hotels (which had a couple of rather bad bedbug years). I always put bedbug traps under the mattresses. Not only have I never found a single bedbug, but no other insects either.