Please help.. I am over-run with gnats. It has been raining for weeks on end and the moisture is causing a big problem. I looked over my chickens and I do not notice any on them. Do mites fly? I believe these are little black gnats. Can I use Sevin-5 in the coop and nest boxes. DE does not work. I have used the sevin-5 in the outside pen, but I am afraid to use it in the coop, but I don't know what else to do. It is rediculous, I have been doing a complete pine shaving change every week and its not helping. Any advice would be appreciated!!