70 years ago when chickens had mites the chicken owners would paint the roosts with used motor oil, this seemed to control the chicken mites. I am building screened bottom boards for this purpose, I am going to coat the top of the bottom slide board of my screened bottom board with a vegetable oil, I also intend to put some borax in a jar lid to see if this will help additionally with the mite control. If this works I will let you know, it sure is a simple fix if it works!
Myron Denny