I have a recurring mite problem...the hens backs and vent areas are mostly affected...skin looks red and irritated, feathers either falling out or pulled out. I have treated birds and coop with sevin dust which seems to help for a while. My question is ithis; can I use a flea bomb (containing premethrin) in the coop...after removing all feed and water, of course. Has anyone ever done this? or should I continue the battle with sevin dust. I feel that I am not getting all the crevices in the coop adequately. Thanks!