BEEKEEPERS say they are being deluged with more than 30 calls a day to move the wrong type of bees.
Chelmsford Beekeepers' Association says it primarily deals with honeybees, which have up to 50,000 in a colony, and not tree bumblebees, an invasive species which have far less.
Association secretary Brian Spencer, who has been keeping honeybees for seven years, said: "At this time of year bees generally swarm and the tree bumblebee likes blue tit boxes, gutters and soffit boards.
"They only have about 100 bees in a colony, but when drones find a nesting colony they fly around outside it like crazy, but they have no sting."
Drones are male bees attempting to mate with a virgin queen and can be present all day every day for a few weeks.
Mr Spencer, of Links Drive, Chelmsford, added: "If you leave them a couple of weeks they will calm down and you'll be left with two to three bumblebees flying about."
Tree bumblebees, which originated from Europe and Asia, first came to the country in 2001.
It is not known how they got to the UK.
They produce very little honey and live in far smaller colonies than honeybees, which number tens of thousands.
Speaking on Friday, Mr Spencer said: "I've had 27 calls today up until two o'clock and ten missed calls, and a lot of them are about tree bumblebees.
"Unless they are in a really inconvenient place like in front of a doorway, I would leave them there as they will be fine – or phone pest control."
Stuart Roberts, chairman of the Bees, Wasps and Ants Recording Society, said the organisation had received a record number of sightings in 2013 and 2014.
"The colonisation and spread of this beautiful bee has been extremely rapid," he said.
