The best method I’ve discovered for killing wasps is to go out and buy one of these wasp traps:

Add some sugar water and a teaspoon of raspberry jam and then watch all the wasps / yellow jackets get trapped and die. (Sept. 22, 2015.)
Add a dollop of some sweet jam, pour in some water sweetened with sugar and then hang or place the trap some place where wasps are known to congregate. I put the trap out this morning and when I came home from work, it was full of wasps — hundreds of them.
I’ll continue to monitor the trap over the next week or two. I’ll stop using it if too many honey bees get trapped in it. Judging only from the first day I had the trap out, I’d say there’s one honey bee for every 100 wasps that get trapped in it. Scroll down to the bottom of this post for the latest results.
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