Care for roses

Hi all,

I have a few roses in my garden, some of them are button size and rest are normal ones. They were growing quite well, but, recently they have started having problems. Some of the leaves have turned yellow, with dark brown spots on them. They soon fall off. The rest of the leaves have started crumbling up. The sizes of flowers have drastically reduced and the buds/ flowers are not healthy too. Have anyone experienced these problems? How do you care for them?

Also, my hibiscus plants have some worms. These worms fold up the leaves and lay eggs within. I try plucking away and crushing, but, doesnt help much as they are spreading at a rapid pace. Could somebody help with this problem?