We have also had lots of yellow jackets in SW Missouri. I was concerned that some of my weaker colonies might be attacked so I made a few traps. I used buckets with tight lids or jars or whatever and by T & E (trial and error) discovered that a 16D sinker nail would allow the YW's to enter buy not the bees. I baited with some old honey that I diluted. The bees somehow get too much of the mixture on them and very few make it out of the trap. I assume that almost anyting sweet would work. I assume a wetting agent mixed with the dilute honey would made it even better. Try it. You'll like it. Jim Shoemaker Brookline, MO (near Springfield and Bass Pro Shop)