By far, the most effective and time-proven repellent for chiggers
is sulphur. Chiggers hate sulphur and definitely avoid it.
Powdered sulphur, called sublimed sulphur or flowers of sulfur, is available through most pharmacies. Dust the powdered sulphur around the opening of your pants, socks and boots. If you plan to venture into a heavily infested area, powdered sulphur can be rubbed on the skin.