My backyard flock has pretty much taken care of any bug problems we've had. However, a neighbor had a sewer problem which meant he was re-routing his sewage to dump in the backyard. Along with the stench we got flies. I am not someone who uses chemistry for such things unless it is absolutely the last resort. We were swatting the flies, then finally hung bags of water along the fence, the trees and bushes. No more flies. I checked the internet and discovered the water bag way seems to be considered "an old wives tale" that doesn't work. It worked for us and we still have those water bags out there and will keep them out there. I haven't seen this issue posted and thought it might be useful for someone else.