Guess you mean "chiggers" by redbugs?
They like tall grass as do ticks also. When I've been around places prone to chiggers, I will dust my shoes, socks, legs, pant legs (up to knee) with Sulphur. Has worked wonders. Non-toxic . Can buy a 5# bag at lawn & garden store for next to nothing. Put some of the powder in a can or bottle with screw on metal lid. Punch holes in lid to make a shaker. Carry it in your truck as well as keep a shaker of it at your house or office before you go outdoors.
Once the chiggers burrow in, start itching, not awful lot you can do until they run their course. I've used antihistimines, nail polish, alcohol, hydrogen peroxide, soap & water, you name it...just psychological & temporary relief. Yes, can be miserable for the first few days.