I know Apivar is Amitraz, and it's the only chemical treatment we have that works. And I know by using it every year the chances of resistance increases, but by rotating it with chemical treatments that don't work is not going to help the situation at all.
The limited avdlibility of mite control products is one of our industries largest concerns. Because we only have one treatment. And by trying to keep pests that are resistant to our effective treatments out is probably in our best interests for the short term anyway. This is one of the main points for keeping US bees out