Yellow jackets everywhere!! Who knows the best trap to kill them?

[Red Rex]

This has always worked for me. Watch those little mf'ers march into the hole at dark, then gas their azz.
I always use about a quart of gas, just because.

TAKE NO PRISONERS!

 

[GAgunLAWbooklet]

I've usually only found one hole that yellow jackets used for both going in and out.

When I pour gasoline into that one hole and plug the opening by leaving the bottle shoved partially in the hole or just place a flat rock over the hole after I pour the gas in, that does the job. Probably within minutes but since you have to do this at sunset when it's getting dark and all the insects are at home in the nest,
I always leave it alone until the next morning. Then sometimes I'll dig up the nest to see what it looks like.