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The economic injury level (pink line) is the lowest mite percentage that will cause economic damage to a beekeeping operation. The economic threshold (green line) is the percentage of mites at which management action is needed to prevent the mite population from growing and reaching an economic injury level.
In British Columbia, the economic injury levels (EIL) have been 3%, however, recent studies suggest an EIL of 1%. In other words, if you find 1+ mites for every 100 bees, you should look into treatment options - especially going into the fall.
If you’d like to learn more information like this, take our online course on Integrated Pest Management for Varroa Control for a one time fee of $49! Click the link in our bio or visit ttp-bchpa.ca/integrated-pest-management.
References:
Morfin, N., Foster, L. J., Guzman-Novoa, E., Van Westendorp, P., Currie, R. W., & Higo, H. (2024). Varroa destructor economic injury levels and pathogens associated with colony losses in Western Canada. Frontiers in Bee Science, 2, 1355401. https://doi.org/10.3389/frbee.2024.1355401
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