I let my chickens free range. Haven't had a problem since we got chickens And we live in the country.
Thete are sprays for that at pet stores.
Here are some things you can try.
I am in Zone 9 in Southern California with very low humidity. I spray the perimeter of my property and base of my house with plain old white vinegar once a month. Must be repeated after every rain event. It does help quite a bit. And I have bunches of animals.
Check out this product.