I agree with sandih. Where do you live? And Japanese beetles are a spring time bug, not fall.
Still you obviously have something going on. I would be sure to have plenty of compost under the roses but also add plenty of ground corn meal. Any variety will do. I would scatter 1-2 handfuls under each rose. Then on the foliage and stems I would spray an equal parts mixture of milk, molasses, and baby shampoo every 2 weeks. The idea with that is to make the plant as healthy as possible on the outside. There is a theory that insects home in on unhealthy plants because they look different. By feeding the microbes on the outside of the plant, perhaps the plant will look less appealing.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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