Hi Speedster,
I ran into this post you made last month. I had a severe problem a couple of years ago with yellow jackets around humming bird feeders. Didn't want to poison them there because of the birds, so I decided to try to make a bee trap. I tried several versons using the idea of trapping the bees in a bottle with nector in it. I'll not bore you with the ones that didn't work well. The final version was a success to the extent that I had planned to submit an article for publish in Birds and Blooms magazine. Before I got it written, someone published one showing the use of a small plastic bee blocker that fits on the bird feeder. I wasn't aware of the inexpensive blocker and decided that my trap would be of no value to bird folks, so I stopped the article effort.
In your case, it might help.
The trap is made from an empty Simply Orange plastic bottle. Using a knife to make X type cuts in the side of the bottle about 3 inches up and then using a hot glue gun to melt the plastic inward at each X, I made funnel type holes allowing easy access but harder to find the way back out. Notice that the funnel shaped holes are on a flat part of the bottle. I noticed that bees will crawl upware and around protrusions on the sides. They go to the top and become airborn then fall back down into the nector. After a few trips, they can no longer get out of the nector and they drown in it. For hanging the trap, I drilled a hole in center of the top and used a string with a knot on the end. Glue, of course, is not needed in the gun unless you want to try to improve the entry funnel.
Just use sugar water about 1 inch deep in the bottom. Shake the bottle just enough to get some of the sugar water on the outside of the holes. The yellow jackets will find it soon and take care of themselves.
I've attached some pictures that might help.
Best regards,
Mack1