Questions answered about wasps - Page:23
Treated wasp nest smells weeks after
It is rare to have a smell coming from a treated nest; however, in hot years, wasps collect large amounts of water to aid in cooling the nest.
If the nest is very damp during treatment, it can sometimes smell damp and musty. This smell will soon disappear as the nest dries out.
Are wasps susceptible to heat?
Adult wasps can endure reasonably high temperatures; however, wasp larvae need a constant temperature to survive.
Adults will collect large amounts of water when it is hot to cool the nest.
We have plastic 'vents' spaced out across the back of our house, about 7feet high. Today, we have noticed what appears to be wasps going in and out of these holes.
From April through to June, if you have plastic weep vents installed in the brickwork of your house and insects are using them. They are most probably bee mason bees.
Mason bees like tiny holes in which they lay their eggs. Plastic weep vents are the perfect size for mason bees.

I have seen a wasp fly in to hole in my wall. Are they building a nest?
If you have seen a single wasp fly into a hole in a wall, do not panic. Watch and see what happens for a while. Is there just one? Or more than one?
If it is early spring, it could be a queen looking for somewhere to nest and has not started building yet.
If more than one goes in and out later in the summer, you have a nest.
Do wasps come out at night?
Wasp are not actively flying at night but do not sleep like humans.
Summer late-night parties in the garden with bright lights will attract wasps from their nests which can become a problem.
If you wake before dawn, open the bathroom window and put the light on, if you have a closeby nest, there is a risk that wasps will fly into the bathroom, even if it is still dark outside.