I am in Ga, and last year the Jap beetles desimated my poor cherry, I was not sure it would survive. I sprayed neem like a mad woman, on the trees and the ground around the trees. Neem does not kill the beetles, but it stops their larvae cycle. This year, the beetles are considerably less. I only have been seeing one or two at time, instead of clusters on each branch/leaf. I belive the neem is what did that for me. They are still here, but I only saw one today on my raspberry. This year I netted the trees and bushes it gets the most, and I used captain jack's dead bug brew. they have one that kills them. It's a powder and I spray with neem to moistion the leaves and then dust with a puffer, so it sticks. It has even rained since then and there is still a lot on the leaves. I think it's helping keep them at bay. But I really belive it was the neem. I did not get the neem for plants that is watered down. I actually got organic neem 100% neem, nothing added, and I mix it with soap and water and spray it like that. Unfortunately, I think the lady I got the neem from has gone out of business or sold it to another company, so I can't tell you who it was.