Solution to killing Japanese Beetles

Does anyone have a solution to get rid of Japanese Beetles? Here in Iowa we have been dealing with these for the past 5 years. We've tried killing them through the roots to no avail. Tried using the products local nurseries have recommended with no luck at all. They started and have continued every year with our Pin Oak tree, and the last 2 years have become a problem with my Hostas and other shrubs, flowers, etc. in the front yard.
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