Diatomaceous Earth.
https://www.jungseed.com/dp.asp?pID=50090
Sprinkled, judiciously, and in a manner not to allow the pet or human to inhale it will keep insects away.
I use it on my garden too.
Thanks. My daughter has talked about Diatomaceous Earth, but I didn’t recognize the acronym.
Dollartree has that for a buck for 5 lbs or so. Pure DE sold as their cat litter.
I used to buy DE for bugs from online (16 years ago or so) and it was pretty expensive to buy and ship.