This could be mild herbicide damage.

That could be it. I remember using some earlier this Spring, I thot extremely carefully(!!!) to get rid of some encroaching grass. AND we live next to a soybean field where they spray herbicides to the point we can smell it in the air.

Do you have a rose midge fly problem? That thin leaf growth often occurs at midge damaged growing tips.

Moses

@Ashley Smith zone 5a Roses are EXTREMELY sensitive to herbicide exposure. Even the tiniest droplets carried on the breeze are enough to cause serious damage. I wouldn't use an herbicide within ten feet of a rose and only when the air is absolutely still.

The chlorotic regions and the serrated margins are characteristic of herbicide exposure.