To me it looks like rose slug damage. Look on the undersides of the eaten leaves and see if there are pale green colored "worms" (actually sawfly larvae). They're immature insect larvae that eat rose leaves.

What York said. Wipe them off.

Yup, rose slugs. I spent nearly two hours yesterday picking them off.

will a slug bait like sluggo remove rose slugs? is there any way to get rid of them besides physically removing them? the reason i ask is because i have 3 kids under the age of 4, so the odds are slim that i'll have enough time to remove them all.

No this will not work at all! They may be called slugs - but are small larvae of sawflies. If you do not have time to inspect the underside of the leaves and squish those you find - you can spray with a real insecticidal soap - or the organic insexticide pyrethrum. I prefer the latter - it is sold in USA under names like: BonideÂs Japanese Beetle Killer. Be careful to spray the underside of the leaves as well as from above.

The "slugs" look like this:

{{gwi:265665}}