We have an uncontrollable fly problem and need all the help that we can get. We have 4 hens in an a-frame tractor with an attached run. The tractor has deep bedding and the run is over bermuda grass. Despite moving it weekly to new areas, the flies are uncontrollable and swarming. Being an ecologist, I try to use natural non toxic methods, but am at my wits end and ready to blast them. So far, with no luck we have tried: Vanillaroma trees Food Grade diatomaceous earth, ECOSmart flying insect spray Citronella candles Rescue fly trap bags (which catch them, but also attract them in droves from outside sources) Fly paper (which they don't go to at all) Cobb pellet bedding Stall Dry Despite raking the run, adding bedding and stall dry several times a week, nothing is helping and the birds and the family is miserable. Any proven help would be appreciated!