I started to keep bees five and a half years ago and have never treated. I have had a coupe of hives that absconded, and one that starved(my fault). Back a couple years ago a neighbor let a commercial bk put 20 hive on his place and was fixing to put another 20 there. I saw him at our local bee club and told him his bee were I/2 mile from me. He asked what I treated with and I told him I have never treated for mites, within a couple of weeks his bees were gone and haven't been back. Worked great for me.
Good luck to you and your bees