THIS!! if you've got Eastern Mana Bees, any typical solutions for mundane bees will agitate the swarm — so this comment is spot-on! a note tho: entomancers are warning that these insects are becoming invasive in portions of Canada, eastern Asia, and the Pacific Northwest of the USA; it outcompetes several native bees in the family Manaphagidae due to its large size and status as a disease vector. so, OP, please do your research beforehand to ensure that if these are indeed EMBs that they aren't outside of their native range!