Viruses of managed alfalfa leafcutting bees (Megachille rotundata Fabricus) and honey bees (Apis mellifera L.) in Western Canada: Incidence, impacts, and prospects of cross-species viral transmission.

•No evidence of transfer of viruses from honey bees to alfalfa leafcutter bees in the same field.•Sacbrood virus, was found in three major alfalfa producing regions in Western Canada.•Two virus were found both in alfalfa leafcutter bee adults and cocoons.