When we get Japanese beetles I put out the (Japanese beetles) traps. One year, we collected gallon jugs full...
I freeze them a few hours, then add them to the compost. Unfortunately, they don’t make good fishing bait!
I heard the eggs can still stay viable.
I prefer to burn garden waste and pest collections. That way NOTHING makes it.
Do you have chickens? They LOVE Japanese Beetles. They are the only predator those jerks have!
I usually have mine on the grapes, but I haven’t seen any so far this season. Hopefully, with all the rain we have had, they drowned in the ground while in their larval phase. Hope Springs Eternal!