In a matter of 3 days my hops plants were being eaten alive by Japanese beetles. A few days ago I bought a trap, placed it away from the hops and shook the bines to get the beetles airborne. This would probably only work in the heat of the day when they are very active. By the end of the day the trap was loaded and the hops saved. Ahhhh...I feel better now.
Short story, we used to gather them up by hand when I was a kid. We would get a handful and throw them onto the surface of our pond. The bass would feed on them like mad. Unfortunately I don't have a pond where I live now :-(