01/11/2026
You treated your honeybees for Varroa mites this fall. But how do you know the treatment actually worked?
That’s an important question, especially as colonies head into winter.
Varroa mites don’t just weaken honeybees directly. They also spread viruses, including deformed wing virus, that can compromise the health of the winter bees your colony depends on to survive until spring.
And here’s something every beekeeper should understand: Applying a mite treatment doesn’t guarantee your mite levels are under control.
Treatment effectiveness can vary depending on temperature, brood conditions, application methods, and the product being used. Mite populations can also increase again after treatment.
That’s why we encourage beekeepers to monitor their colonies rather than assume everything is fine.
One method we use is an alcohol wash, which allows us to estimate Varroa infestation levels by counting mites collected from a measured sample of approximately 300 worker bees. While the test sacrifices the sampled bees, it gives us valuable information about the health of the remaining colony.
Our approach is simple: Test, make informed decisions, treat when necessary, and verify the results.
As we head into November, it’s worth remembering that healthy winter bees are raised long before the coldest weather arrives. Late-season mite management matters, but it can’t undo damage that’s already occurred.
If you’ve treated your colony but haven’t checked your mite levels afterward, don’t automatically assume the job is finished. Follow the treatment label and verify effectiveness when conditions allow.
Want to learn more about managing healthy honeybee colonies throughout the year? Comment BEEHIVE and we’ll send you access to our free beekeeping education portal.