I live close to the Wisconsin River, very sandy soil and have a HUGE gnat problem. (Actually Googled "how to get rid of gnats" in relation to chickens and that is how I found this site!) Anyway, tried a suggestion of pure vanilla extract spray, and my girls were NOT happy with that procedure. Also read something about prorethrin?pyrethrin? something along those lines. Well, I went to the local feed store and got two canisters of a "dust' with the pyrethrin/prorethrin in it. Gal at the desk said this year is one of the worst she has every seen. So here is my question, how do i go about "dusting" my girls? I am worried I will dust them too heavily. Can I mix dust with the sand the girls take a sand-bath in? I know the gnats can kill my girls (in their nostrils/gland areas), but I am afraid Im will do more harm than good with the dust. Anyone have any hints or some reassurance?