My sister is a wildlife officer in South Carolina. Since she deals with these outside pests a lot, she searched for new things to try and settled on lemongrass oil. You can buy products with it, or make your own. She made one with my daughter that included lemongrass, beeswax and American Beauty Berry. She says the ABB is very common throughout the Southeast and is a great repellent. The cream she made works great!
You can google those ingredients and find the recipe that suits you best.