That should be coming to an end with this colder weather we are having now. Next year, start by trapping in the spring the get the queens as they come out of the ground. Then run your traps most of the season. For most of the year they like to feed on protein (meat). Later in the fall they like something sweet. The traps were really used for wax moths but work real good on the YJ's. You can find the recipe to put into the soda bottle on this forum and others. It's just water, sugar, vinegar, and a banana peel. This winter, get busy and make yourself some robber screens to place on your bees for next year.