I have found that Torula Yeast works very well as a wax moth bait. The state of California uses it in Mcphail traps (glass traps containing a bait solution) to monitor for fruit flies like Medfly, Oriental Fruit Fly, etc. It is a broad-spectrum lure. A couple of tablets in a pint jar of water works very well. The only problem with this bait is that I don't know where you could get it. If your local agricultural commissioner is using these traps, they may give you a small amount to try. They are used in Southern California and coastal counties up to about the Bay Area. Bananas and vinegar are more available but I thought the banana would get too funky too fast. The yeast solution never does.
Bob Roach