I'm so sorry to hear about your Japanese Beetles attacking your roses. I had a similar problem and the darn things ate the rose buds before they could open and they also ate the leaves. I'm afraid your rose bushes may not come back unless you can get rid of the beetles before they eat all your leaves. The only thing worse than Japanese beetles eating your beautiful roses is having your dog eat them. LOL I am serious about this, apparently the thorns didn't present a problem for Tara (should have named her Terror). Good luck with your roses.