Nov. 7, 2019
Health Canada's Pest Management Regulatory Agency (PMRA), under the authority of the Pest Control Products Act, is granting registration for the sale and use of Potassium Beta Resin, a manufacturing concentrate HopGuard Liquid and the end-use product HopGuard II, containing the technical grade active ingredient hop beta acids (present as potassium salts), to control varroa mites in honeybee hives.
Hop beta acids (present as potassium salts) are naturally occurring weak organic acids produced by hop plants (Humulus lupulus L.). Hop beta acids (present as potassium salts) are the active ingredient used to formulate HopGuard II, which is used for control of varroa mites in honeybee hives. HopGuard II consists of strips impregnated with hop beta acids (present as potassium salts) which are placed in the brood chamber of bee hives by hanging the strips over hive frames. The mode of action of hop beta acids (present as potassium salts) in killing varroa mite is likely from physical damage to mites leading to death.
Varroa mites are the most important parasitic pest of honeybees, and have a severe economic impact on the Canadian beekeeping industry. Significant varroa mite infestation in a honeybee colony will cause the loss of the infested colony. Based on the mode of action of HopGuard II, varroa mites are not expected to develop resistance, which is a problem with some other varroa mite control products.