One good shot of wasp/hornet spray in the nest opening should do it.
I've heard it is best to spray at night but I've done it many times in
the day as sprayed yellow jackets are disoriented and don't get you.
In the south they nest underground, so there must be a hole. I've found
it takes only a tablespoon of gasoline. Sometimes waiting until sunset
has helped me locate holes, but papas grass could make it tough.
You could wait until dark and toss a piece of liver where you think the
hole is. Liver attracts skunks. A skunk who finds the hole will
destroy the nest.
Another trick is an electric bug zapper on a long pole. Stick it where
you think the hole is and shake it until the yellow jackets attack it.
Because I had one in my compost heap. The entrance was right on top of
the pile with what looked like a marbleized plastic spill around the hole.
I saw the wasps entering and leaving the hole. Because mine was on top
of a pile, I just dug it up with a pitch fork and destroyed it.
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