On 2013-05-05 18:57:34 +0100, David Hill said:


If the cottage is owned by you as landlord then just get it properly
repointed.

Rod

Late in the year, though.

Why, by then they will be hibernating in the walls.

It appears to be a question of letting the female finish laying her
eggs. and timing it before hibernation starts, encouraging them to go
somewhere else. Unfortunately, the re-pointing in late summer will
prevent the emergence of new bees next year though. But if it's a
serious problem for the owner of the building they have to persuade Mrs
Bee to go elsewhere and re-pointing seems to be the only way to go
about it. They go back to where they were born to lay again and can
eventually cause quite a lot of damage because they keep on boring into
masonry to make new holes for new generations.
--

Sacha
www.hillhousenursery.com
South Devon
www.helpforheroes.org.uk