I haven't had to deal with chiggers in a long time, but growing up in the Ozarks they were quite a problem. Flowers of sulfur--as someone mentioned in a recent meeting--is a very effective chigger repellant. Better than Deet. It smells of rotten eggs, so it can repel unwanted people as well. I can't remember ever having a problem with chiggers, ticks, etc. if I remembered to dust my shoes (yes, we wore them on occasion), socks, and lower pant legs. I'm sure it's hard to find in stores now, but it's readily available on the web for around 50 cents per ounce. I just bought some. Look for powdered sulfur or sublimed sulfur, as "flowers of sulfur" turns up mostly antique jars and cans.