For northern climate beekeepers now is the time to do an Oxalic Acid Dribble. Not all, but most mites are phoretic now and you can really do a number on them greatly increasing the chances of overwinter survival. Im treating all mine this week. I dont bother lifting and treating between boxes. Just remove the inner cover and drip roughly 5ml per seam. Quick and easy. Hoping everyone has booming hives this spring!