Wasps

Negative Characteristics: They can inflict a nasty sting if provoked.

Redeeming Characteristics: Top predator in the garden devouring many insect pests.

Quick tips:

Be safe, wasps will gang up on you to protect their nest.
Wear a hat/veil and thick clothing. Don't climb ladders to access the nest.
Choose the right product for the nest - sprays if you can see the nest, - powders if you can't
Watch the nest for several minutes before you approach in order to work out their flight path.
Move slowly and avoid the wasps main flight path to and from the nest.

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Your Questions Answered

Q.
Is August a good time to destroy a wasp nest

If it is giving you a problem, destroy it as soon as possible. The longer you leave it the more wasps there will be and the greater the threat they will be to you when you do go in to destroy it.

Q.
Hi We get upto 5 nests a year, every year. Sometimes in the garden, but generally in the loft. I think they are more attracted to the area above the bathroom, where the hot water tank is. Could this be one thing they are looking for in April - the heat? I have changed all soffits & fascias for plastic, and just in this little area around a dorma extension, they are getting in. Any comments or advice welcome. russell.levermore@db.com

I think you are right about the attraction of warmth for the queen to build her nest. If it is possible, I would put a good dose of powder behind the soffit boards. you could use an insecticidal powder like Insecataban for swift effect. Once you have eliminated the present inhabitants, you could use a non-toxic powder like Agrodust, which will sit for years in the voids and any wasp entering and exploring with a view to building a nest should come into contact with the Agrodust and subsequently die from dehydration. It is essential that the agrodust remains dry in order to be effective.

Q.
If a powder is used away from the nest will the wasps take it to the nest on thier feet and reduce/ destroy the colony? Cheers. AJM

It would need to be ideally at the entrance to the nest as far as is possible, but in theory yes the wasps will take the powder into the nest as they enter

Q.
can nests be in small holes in brickwork, i keep seeing wasps go in and out of several tiny holes above kitchen window

Wasps will happily build a nest in cavities behind bricks and this time of year it is common to see lone wasps flying in and out of holes between bricks looking for nest sites. Block the holes up before the wasps take up residence and you have a bigger problem