My father swore by sulphur as a deterrent. Seems like the powder was called Flowers of Sulphur. He carried a large salt shaker of it all of the time. When he was at the farm he would dust his shoes, sox, pants legs, etc. with it each time he got out of his truck.
I just carry an aerosol can of Off with DEET and almost never have a problem.
Bing
