This report details a surveillance study conducted in Ontario to evaluate how effectively three common synthetic acaricides—Apivar, Apistan, and Bayvarol—kill the parasitic varroa mite. Researchers utilized the Pettis test across various apiaries to determine if these pests have developed resistance to the chemical treatments meant to protect honey bee colonies. The findings indicate that Apivar remains the most successful treatment, while significant resistance was detected in both Apistan and Bayvarol populations. To combat these rising survival rates, the authors emphasize the necessity of regular monitoring, proper product rotation, and the integration of alternative control methods. Ultimately, the study serves as a guide for beekeepers to make informed management decisions to prevent widespread colony loss. #honeybees #valleybeekeeping
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