Another John wrote:
We have a very large wasps' nest inside the eaves of our roof - football
size. (My question is at the end of this message.)

I've repeatedly sprayed it with the excellent Rentokil "Wasp Nest
Destroyer", but inside the roof space I can can only see (and therefore
spray) the inside half of it -- the rest is buried right into the eaves.
I cannot get nearer to it than about 3 metres (and in any case I don't
want to!).

I put up the ladders to the gutter, and tried to spray between the gaps
in the tiles, where the buggers are getting in, but the spray clearly
doesn't reach: they must have a walkway up to the nest,and the poisonous
foam must be dissipating before hitting any part of the nest.

After a week of trying repeatedly (three cans of Destroyer used!), I've
had to call quits.

My question: will winter kill this nest and all its inhabitants, or am I
going to have to call an expert?

Cheers
John

https://homesteady.com/cheap-way-kil...s-5575868.html

"Borax, Under $5

You can kill wasps cheap with Borax. Borax is made of boric acid
and has been used as a safe household cleaner for over 50 years.
A box of Borax costs about $5 USD, as of 2009. You may already have
some in the house. Mix equal parts Borax and honey or corn syrup.
Spoon the mixture into some old lids. Strategically place them close
to the wasps nest. Wasps are lured in by the sweet taste of sugar,
but are poisoned by the Borax."

Not all insects fall for this sort of approach.
But it might work.

The insects know it's there, but the mix may not
have enough "attractant" to make them voracious.

Mix 1:1 if the insect is non-social, and won't be feeding others.
You can mix 1:1 borax to icing sugar, to kill sugar ants.
(Even though in theory, 1:16 would be the right one to use.)

If killing a nest requires a forager to feed someone in a nest,
try 1:16 borax to sugar, so the forager stays healthy enough
to make it back to the nest.

I only looked up this possibility, because I suspected I may have
killed a wasp nest by accident here, this summer. It was above
my head the whole time and I didn't know it was there. The queen
was flying around the house for *days* trying to pick a nest site,
and when I didn't see it anymore, I assumed it had "buzzed off".
But no, it finally found a spot.

There's a theory that they don't go back to the same spot
each time, because they can "smell" the nest of the other,
and don't want to get into any nest fights. The house next door,
has not had a nest where a large nest was located years ago.
They have a "preferred side of the house", in terms of siting.
This year, the nest was located under the lip of my chimney slab.
The nest stopped at grapefruit size. Normally the nest doesn't
stop growing, until I stop it. I only used insecticide on the
first one. I have other means now for the job. I think
angle grinder will be for the next one :-) By other means,
none of those methods are suited to "submerged" nests in tight spots.

And that's why we have the borax, to use a food-based approach
for the tight spots.

Paul