That looks like the start of rose slug damage to your leaves... Be glad you caught it early... It sort of a luck of the draw... You could do nothing and the damage might not get to bad OR damage could get very ugly... Depends...

Rose slugs look like little greenish worms and can be found mainly underneath leaves...
You can slide your hand underneath leaves to pull them off or just pick them off... This should be done when you first start seeing leaf damage on your bush...Then follow-up from time to time afterwards.

Or spray the top/bottom/canes of the rose bush leaves with a Spinosad product. Spot test spray a few leaves first to make sure they are not sensitive to the spray.

Safer Soap product also works... Follow all directions carefully for best results...

Usually in a couple weeks good predator bugs come along and destroy the rose slugs--unless you have been using insecticides in the past and thus have destroyed the good predator bugs in your yard.

Often the damage to the leaves that we see is what was caused earlier by the rose slugs which are gone now but the leaf damage remains.

At any rate, check the underside of leaves for teeny, tiny green "worms"--squish them or toss them into the lawn--they aren't likely to find their way back.

Kate

I don't speak to much about predator bugs Kate because here there is none to take care of 1 inch long rose slugs besides the occasional bird or some predator wasps which seem to only show up in force toward the end of the season....Alittle too late...
Some areas rose slugs will eat the entire bush of its leaves and only picking them off or spraying will help if done early enough...

Just depends on your area and what type of predators you have ...And year to year damage will be different...

I get massive rose slug damage. I've held off on using chemicals, but I've been waiting 3 years for the predator bugs to show up and they have yet to arrive. My refusal to get rid of wasps' nest is driving the husband batty.

I think that not having a mono culture of just one plant has helped draw in the birds.

Hello JrTack, welcome to the rose forum. I think your foliage looks terrific. The slug damage is minimal and I wouldn't spray at this point -- rose slugs appear in early spring and vanish when the weather heats up. Sort of like aphids -- a large number appear when the bushes first leaf out and then only minimal numbers for the rest of the growing season. Your roses are in good shape, enjoy the flowers.