Houdini Fly Hunt launched to protect native mason bees in WA, OR

The Houdini Fly Hunt, launched by Rent Mason Bees and UC Davis, aims to mitigate the impact of an invasive parasite threatening mason bee populations in the Pacific Northwest. This parasite, the Houdini fly, was introduced from Europe and lays eggs in mason bee nests, leading to starvation of the bees. According to UC Davis PhD candidate Abigail Lehner, there has been a marked increase in the fly’s presence this year, primarily due to unmaintained backyard bee hotels. McKelvie, managing director of Rent Mason Bees, stressed the responsibility that comes with hosting bee hotels, warning that neglect can lead to the proliferation of parasites. She advises bee hosts to place clean nesting materials in early spring, remove them after the season, and clean cocoons in the fall.

This initiative also offers a chance for citizen scientists to contribute by reporting sightings of the Houdini fly. The campaign highlights the critical role of native pollinators in ecosystems and the urgent need for public engagement. Proper maintenance of bee hotels is essential for the survival of mason bees.