True, but I don't intend to treat tracheal mites with grease patties the first year... and even in the second year and going forward, they'll be used only in conjunction with the late fall menthol treatment, and thus I won't likely use them continuously, perhaps only a few months a year.
Well if your bees make it thru the first year without treatment, than chances are they are resistant, so why treat at all after that.