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This is a revealing post about northern fowl mites, from someone who obviously has experience that I don't have: https://www.backyardchickens.com/t/854408/bird-mites/0_20#post_12819830

Yup. You can also purchase Sevin liquid which is good for spraying on cracks in the coop, the underside of the roosts, etc. (Certain mites stay under the roosts during the day and get on the birds at night.) I''ve seen a 7 day withdrawal recommended for Sevin, but I know lots of experienced...