Just a quick question to see if anyone has researched using ultrasonic repellent for Japanese beetles?
Seems to have it's ups and downs
If it works on the beetles, it would mean not having to use pesticides, however, if it DOES work on the beetles, it most likely will drive other wanted insects out of your garden as well.
units range in price from $10 up to over $100
Here is the one I'm looking at for outdoor use