The beetle traps are the worst thing to use. They are scented with mating pheromones, which actually attract the beetles to your yard. So they find a great food source, as well as a likely mating point. If you really want to draw them away from your yard, give several traps to each of your neighbors.
The best way to use these traps is to put them in your yard as far as you can from where you want to keep the beetles, and use them as a detection device. When you find the first beetle in your trap, take the traps down, and cover your plants with chiffon type fabric. It'll allow the sunlight through to keep your plants growing, and since JB drop down from the air and don't crawl up plants, they will not be able to get to them. Once the JB have mated and done their thing, you can remove the fabric.