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2 ounces or 60 ml per 3 gallons of water (Permectrin II) is what a link I just read is for poultry mites. That is equal to 20 ml per gallon. Spray each bird with 15 ml (1/2 ounce.) Label is below. In cold weather using permethrin dust is preferred, and a sock filled with powder is a good method...

Here are a few articles to read about mites and how to control them: https://www.veterinaryentomology.org/northern-fowl-mite https://edis.ifas.ufl.edu/publication/IG141 How are you mixing your permethrin? The label should have different mixes for northern mites and general use.