This text chronicles the history and management of Varroa mites within Ontario’s beekeeping industry since their initial discovery in 1991. The author outlines a cycle of chemical resistance, noting how early synthetic treatments like Apistan and Checkmite+ lost efficacy over time. To combat this, the industry has transitioned toward a diversified rotation strategy that incorporates synthetic strips alongside organic acids and botanical treatments. Recent developments highlight the importance of Pettis testing to monitor for pesticide resistance and the introduction of new products like Bayvarol. Financial support through government funding is now available to help beekeepers implement these diagnostic tools. Ultimately, the source emphasizes that long-term colony survival depends on a sophisticated understanding of mite reproduction and the disciplined rotation of various control methods.
