Typical swarm locations
Dartmoor edge gorse and heather scrub at Roborough Down and the moor-gate verges attract swarms in late May and early June. Oilseed rape field margins on the Bickleigh and Roborough farming land produce strong prime swarms from late April. Suburban sycamore and lime in the Crownhill residential streets off Tavistock Road host clusters through June. Farm outbuildings and stone walls on the Dartmoor foothills approach are common cavity swarm sites.