Sevin, pyrethroids or can hand pick them...dep;ends on how bad. They like sweet cherries.

Sevin.

If sevin can't kill it, then its time to learn it's language because its going to take over the Earth like a cheesy 50's horror movie.

Are pyrethroids at all affective against this pest? I am thinking of tank mixing some with Sevin to increase staying power. Sevin does wear off relatively quickly even though there's no denying its knock down power of JBs.

Japanese beetles killed my new sweet cherry tree around five years ago. We used to get thousands of them. Since then, I have put down milky spore in the lawn about 5 times and only see maybe a hundred in a season now. I regularly pick them and kill them in soapy water. Milky spore takes a while but it really seems to work.