I don't think you would need to whack the bugs just have the lite close to the water and they will fall in and git et. June bugs especially don't fly well and crash in
I have never seen "June bugs" (the big green ones) fly at night. Only the "May beetles" (brown and smaller than "June bugs") fly at night, at least around here. I also have one of the solar spotlights over the water, but not many insects fly unless the night temp is above 60 degrees. I need to start walking the footpath over there after dark and watch the next warm night.
