Online, I read that you could use various poisons and then the good stuff:
strong coffee
catnip
chives
soapy water
Somehow when we garden there is this thought that comes to mind - spray them.
I mixed 16 ounces of water with 2 tablespoons of dish soap in a spray bottle. It does the trick. The japanese beetles fall right off after a minute or two.
Other gardeners have reported that they flick them to the ground or in a bucket of soapy water.
It all seems to work and since they are most active during the day - and a bright copper color - you can see them, spray or flick them and eat your food later. But it looks like if you leave them alone, they can do some real damage.