Even though this is an older thread, I'll respond. I never had any luck with DE. I know some people swear by it but it hasn't worked for me. What has worked well is permethrin. It is also used as a spray to spray on clothing as a repellent though I have never bought any for clothing but I do buy it for use in my coops and on the birds when needed. Sevin isn't approved anymore for use on animals. Poultry dust usually has permethrin in it. It works. It doesn't kill the pests eggs so repeat weekly treatment for 3 or 4 weeks is necessary as the pests eggs hatch out. These are the products I have used with great success. Good luck to all who have had issues with mites and lice and other pests (flies).
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