A 2006 study found that a spearmint spray killed 97 percent of varroa mites collected from an infected honeybee colony. Mint flowers are so popular among foraging honeybees that peppermint oil is often used in bee learning experiments.
Using Essential Oils for Honeybees. Three primary essential oils are useful in beekeeping: lemongrass, spearmint and thyme. Other oils such as wintergreen, spearmint and tea tree oil are also used in some formulations.