Apiguard: is for the treatment of varroosis due to varroa destructor in honeybees. It is a Thymol based product that is used in the control of varroa mites in bee colonies. Its active ingredient Thymol(CAS# 89-83-8)..25% is derived from the thyme plant. It’s unique slow release gel matrix formulation and easy-to-use dosing syringe ensures correct dosage of the active ingredient. Apiguard has no harmful effect on the honey bee colony, neither on brood or adults, when used according to directions.