Controls trachael mites. Mite-A-Thol (R) pre-measured packets make application easy. Just place a bag on the top bars of each hive when the daily temperature is above 60 degrees, and be sure to remove the menthol a month before you add your honey supers. Four packs (unused packs may be kept in a zipper-lock bag in your freezer). Note: never medicate when there is honey on the hive for human consumption.