North American Mite-A-Thon: May 1st-16th & August 14th-29th

Mite-A-Thon is a tri-national effort to collect mite infestation data and to visualize Varroa infestations in honey bee colonies across North America within a two week window. All beekeepers can participate, creating a rich distribution of sampling sites in Canada, the United States, and Mexico. Their Varroa monitoring data will be uploaded to The parasitic mite, Varroa destructor (Varroa), and the viruses it vectors is a significant driver of this honey bee colony mortality. Yet, indicators suggest that many beekeepers are not monitoring honey bee colony Varroa infestations and therefore not able to connect infestation to colony loss.

OBJECTIVE: 1) To raise awareness about honey bee colony Varroa infestations in North America through effective monitoring methods. 2) Management strategies will be made available for discussion within bee organizations utilizing Mite-A-Thon partner developed information and outreach materials.


Spring: May 1st -16th, 2021

Summer: August 14th - 29th, 2021

PARTICIPANTS: All beekeepers in North America are encouraged to participate

COST: There is no cost. You can create your own test materials or kits can be purchased online and at your local bee supply store.

OUTREACH: Promotion of Mite-A-Thon will be through local bee clubs, state beekeeping organizations, and national associations (see partners for examples)

DATA COLLECTION: Participants will monitor the level of mites (number of mites per 100 bees) using a standardized protocol utilizing two common methods of assessment (alcohol wash or powdered sugar roll) and then enter data, including location, total number of hives, number of hives tested, local habitat, and the number of Varroa mites counted from each hive. The published information will not identify individual participants.

Tips: Due to potential shortage of isopropyl alcohol caused by the COVID-19 pandemic, we have heard from some of our experts that winter-grade windshield wiper fluid (methyl hydrate) works as well and may be easier to obtain. Thanks to Meghan Milbrath (Michigan State University), Peter Armitage (Newfoundland and Labrador Beekeeping Association), and Geoff Wilson (Saskatchewan Provincial Apiarist) for the advice.

SPONSORS: Sponsorships are being solicited to underwrite costs and grants, as necessary.

CONTACT: or 415-362-1137

TO DO: Determine your preferred method of testing for mites and commit to a day for testing, either individually or through beekeeping organizations, and report your data (see above).

Submit Your Data

Final Analysis Reports:

2020 Mite-A-Thon Report

2019 Mite-A-Thon Final Analysis Report
2017 and 2018 Mite-A-Thon Analysis Report

Email with any questions.