No, I don't say anything in my description. I also don't mention that since it's the tropics, the insect life is quite prolific 🙂 I'm clear in my listing re my limited Wifi, the fact that I have a dog and a cat (don't book if you have allergies), things that specifically pertain to my listing, but things that are just a given in the whole area, I mention when they arrive. I keep it casual, mentioning those things when they arrive or shortly after, just like showing them where the light switches are, how the fan control works, etc. As I host in my home, and meet and greet all the guests, it's easy to convey information in a matter-of-fact way.
If they weren't aware that insects are endemic to the tropics, that's on them, not me. A casual warning not to leave food around, empty food wrappers, rinse out your pop or beer cans, etc. or they might find an army of ants have moved in, in my way of thinking, is a better approach than scaring guests before they book who may be bug-phobes. Same with warnings about safety. I think it's common sense, but I do mention it, but don't want to give an impression in my listing info that the guests have to fear for their safety.