No Cost Most Effective Wasp (yellow jackets) Trap My Grandmother Taught Me And Still Used Decades Later By All In Our Family: Collect Empty Jam (Preserves) Jars, wash and rinse, punch holes in lid just big enough for the wasps to enter into the jar; spread some preserve on the inside of the lid and fill jar half way with water. Once the wasp enters through the hole to access the preserve spread on the inside of the lid, they can't exit back out due to the hole being punched from the outside in and the jagged edge on the inside. Spread several around, hanging on tables etc, you'll be amazed how many you'll catch.
We've used this method for untold decades on our family farms and acreages passed down from generation to generation. Our daughters are now doing the same around their decks and yards when needed.