Varroa mites are out to get the bees in your hive. A horrible (and relatively new) problem in the apian world, varroa mites can wipe out a hive in one season.
How to control varroa mites
In our new video Trica shows how to test for varroa mites and combat them. Most bees have no way to combat varroa mites, and that's where you as the beekeeper need to take a hand. Defend your bees through a combination of controls such as good hygiene, monitoring, and -- when necessary -- naturally derived miticides. With a Mite Observation Board under your Screened Bottom Board you can get a head count of the mites currently in your hive. If the mites are numerous, use Apiguard® with the active ingredient Thymol (from the herb thyme) which is labeled to control varroa mites. Just take a look at some varroa mites sucking the life juices out of a bee. Want to fight back?
A biologist has beekeeping, and varroa-mite-fighting, advice