... or you can do nothing. I pull out my drone frames, capped, and before they start hatching, setting off a varroa bomb. I like spot checking for mites when the drone frame is pulled, prior to freezing. I use a dental pic to uncap and pull drones. It's easier to see the mites crawling. When they're pulled from the freezer and thawed, they go back into the hive and I let the bee's pull out the dead. Gives them something to do.