Last summer I had a huge colony of yellow jackets living in my wall.
Maybe not as exciting as killer hornets, but still terrifying
to me at the time.
The first sign was coming home to find dozens of yellow jackets in my
basement, which congregated around the light after I turned it on. I
caught most of them with a butterfly net. Next day, same thing. Two
days later, they worked their way up to my bedroom, apparently having
eaten through the radiator pipe seal. I focused on my bedroom, catching
maybe a dozen per day and increasing. They flew out of my printer when
I printed a page. Flying insect killer would only kill the ones I
hit directly. I started to feel like I was living in the kind of
nightmare you see in movies.
I found their entrance hole in the wall outside the house, with
hundreds coming in and out. I tried spraying hornet/wasp killer
deep into the hole, but no luck. I was warned against sealing the
hole, since they would escape into the house, chewing their way through
the wall if necessary.
Being a cheapskate, I didn't want to an exterminator to rip open the
wall, with repairs to the wall that might have cost thousands, as was
suggested. Instead, I ran a shop vac hose next to the opening, sucking
up any wasp that tried to enter or leave the hole. After 24 hours, the
shop vac was 1/3 full of solid wasp mass, maybe 10000 of them as a
guesstimate. I left it running for a week, each day finding fewer.
Then I ran it during the day every couple of days, finding less each time.
After a month or so, a batch of new queens and drones came out
among the workers, and
eventually nothing.
There might have been 50K, maybe even 100K total. It was interesting how the queens were very robust
and hard to kill compared to the smaller workers.
Close to wintertime, when I was pretty sure they were all gone, I sealed the
hole with putty.
I read they don't often return to the same nest, and luckily there was
no sign of them this year.
Amazingly, I wasn't stung even once throughout all of this, although
I was very careful, donning a raincoat, gloves, and a butterfly net over
my head in the beginning. On the other hand, my GF was stung a couple of times on her face
at her house, causing lots of pain and swelling, just by casually walking next to a bush where they had a nest
in the ground.