How to eliminate wasps/hornets/yellow jackets:

They are carnivores this time of year.

Mix lots of borax into tuna fish and place the dish outside.

If you have cats, cover the dish with a clay pot or something to keep the cats out of it.

The wasps will collect the poison tuna fish and take it back to the nest and feed it to the larva. The whole colony will die off in a few days to a week.

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Borax works for fire ants and other ants too. Dissolve lots of borax and sugar into hot water to make a thick syrup. Pour it around the ant nest. They will collect it and take it to the colony to feed it to the queen and larva. The whole colony will die off in a few days.