starting this duplicate down the page.

Hi, I'd start spraying for bugs if you want perfect leaves. I use the Bayer insect/disease control- good results.

Looks like rose slugs/sawfly larva. Little green caterpillar things on the underside of leaves. You can just squish them by hand. They don't do any real damage. Please read previous postings on the pros and cons of spraying, especially for insects. Many sprays hurt good bugs, including bees.

Cat'sRose has it right. These guys are transient, so the problem is self-eliminating.

But the damage IS annoying -- so if you want to stop them in their tracks, just squish them with your gloved hands (or bare fingers, for that matter).

This isn't a pest worth the collateral damage you'll do by spraying with pesticides.

Jeri