Mites feed on hens while laying, brooding and sleeping these areas are where mites live and where diatomaceous earth is best applied.
Hens: Dust between the feathers and onto the skin
Nests: Remove all used bedding from the nesting boxes sprinkle diatomaceous earth on the surfaces then replace with fresh bedding, lightly sprinkle diatomaceous earth onto bedding and work in.
Roosts: Sprinkle on and around roosting areas
Dust Baths: Add diatomaceous earth to hens natural dust baths
AVOID INHALATION AND CONTACT WITH EYES