Had to look that up. Silica dustI struggled with mites this year. There is a difference between northern fowl mites (these live their full life cycle on the birds) and red mites (feed on the bird usually at night and live in cracks/crevices in the coop during the day). I had red mites (it sounds like you do as well). I straight atomic bombed my coop with permethrin, elector psp, and Bifen IT, multiple times over 3 weeks and the mites crawled through everything alive and charged. I swear it gave them super powers. I cried and sobbed not knowing what to do to get rid of these bugs after spraying and spraying and spraying. Nothing got rid of them. I called a pest control company to ask for advice and they told me Cimexa. Dust it into all the cracks/crevices and roost bars and wait. After 48 hours, i saw a HUGE reduction in the mites, and after 72 hours i didn’t see a single live mite in my coop. In addition to the cimexa I sprinkled the floor with diatomaceous earth. Now I know neither of these are safe for our lungs or theirs, but nothing else worked… and I mean nothing. I wore a mask during application and anytime I went into the coop (I have a big walk in). After the 4th day, I hose out the entire structure with a pressure washer, allowed it to dry and then redusted the roost bars and perimeter of coop inside and outside with more cimexa. Oh, and I also dusted every chicken with DE so that any mites that were on them or made it past the trenches of hell would hopefully die.
I’m happy to report that all chickens are alive and well, appear less stressed, less scratching, etc. I no longer see mites on them or in my coop. Good luck to you. You are not alone in this. It’s overwhelming and exhausting and infuriating. But you can do it
