re: What is the best way to kill a yellow jacket best in the ground?

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I did it last week. Used half a can of this foam at night. It did the trick.

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Same.

The simplest answer is often the best - if you have wasps or hornets, use a can of wasp & hornet spray. Once that foam hits the hole, they can’t fly out. They crawl out throug it looking really pissed off, then die.

Protective gear recommended.