>So one could surmise that a miticide's effectiveness for varroa control
isn't chiseled in stone.

Kirk, miticide resistance generally comes at a cost to the mite, and gives
resistant mites a "fitness" advantage only so long as the miticide is a
major cause of mite mortality.

In the case of fluvalinate, it has been clearly demonstrated in Europe that
resistant mites reproduce at a lower rate than non-resistant mites, and are
simply outcompeted by non-resistant mites within a few years after the
miticide pressure is removed.

Randy Oliver

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