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If you are finding mites in your housing and on your chickens, you will want to treat both with a Permethrin based poultry spray or dust. If your weather is cold, then use the dust for the chickens. Spray can be used to get into the nooks/crannies of the housing on a warmish dry day. Don't forget to clean out bedding and treat roosting bars and nesting boxes too.
Repeat treatments in 7 day intervals.
You could also use Spinosad (Elector PSP) instead of Permethrin to treat birds and housing.