it took meet forever to finally rid mine of mites!!! They came infested. like yours. what I finally had to use. is controversial but worked well without any issues. I used one part iveimectin to three parts water and painted with a all brush the back, under each wing,around the bottom. before iveimectin I had tried all the powders they didn't work for me. I hope you have better luck than I did with them.mine were northern foul mites.best wishes