Take a mite count doing an ether or sugar roll and determine the level
of mites you have in a hive or hives.

Then install a sticky board and 1 or 2 apistan strips and after 24-48
hours see what kind of drop you get with the Apistan. Repeating this
with other types of treatments will give you some insight to if you have
resistant mites.

Resistance is real and rotation of miticides is a good approach.
Formic Acid and Thymol are now approved in the US and are good
soft alternatives that mites will not become resistant to.

IMO Checkmite should be reserved for severe problems and only
used as a last resort.

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