Figure 1. Mean varroa infestation levels and treatment thresholds in Ontario commercial and small-scale honey bee operations, 2017.

Mean varroa infestation of commercial honey bee operations was 0.16 per cent in April, 0.15 per cent in May, 0.36 per cent in June, 0.49 per cent in July, 0.62 per cent in August, 1.98 per cent in September, and 2.54 per cent in October. Mean varroa infestation of small-scale honey bee operations was 1.58 per cent in April, 1.25 per cent in May, 0.52 per cent in June, 0.60 per cent in July, 0.80 per cent in August, 1.81 per cent in September, and 3.67 per cent in October.



Back to 2017 Provincial Apiarist Report, Figure 1