Half a cup each of apple cider vinegar, sugar, water, and a tablespoon of dish soap helped empty out a portion of the population of a wasp nest in the yard we couldn’t get to. Two dishes like this absolutely filled in 5 hours. The wasps have been super aggressive as it gets colder here again already. A guy on one of our tree crews got nailed 12 times the other day.
Are they attracted to it or something?
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Yes. I’d guess the sugar, then the other ingredients mess them up enough that they fall in. And the few that do make it out tell all of their friends. Both bowls were practically swarming within half an hour.