One thing I will say id diatomacous earth will not kill lice or mites if you already have them, get something like sevin dust and until you can throughly clean out your coop put the dust all over inside being sure to get it into all the cracks where the mites live and hide.. once you can clean out your coop you need to remove all bedding and then really give it a good cleaning I like to use sevin spray because I think it gets into all the crakes better and I can cover everything better too. dust all your birds being sure to get it into the feathers but not into their eyes or let the dust get in the face to inhale, there are other products you can use too, one is Ivermectin pour-on for cattle you use it like you use frontline on dogs just be sure to get it on their skin 4 drops for small and 6 for large fowl. then theres also Epernix pour-on, used the same way only no egg withdrawl from using it.. after you get the parasites killed then use the DE. I have used DE for close to 7 years now and last summer had my first mite infestation, had to bring out the big guns, still use DE too. some folks also spray Adams flea and tick on their birds but you wouldn't want to wet them in cold weather.. good luck and keep us updated on progress. also forgot to say both of these pour-ons will take care of internal parasites too.
