I have that on a few roses. I think it's sunburn.

did you check for spider mites?

Jim - I really do need to have my soil tested to see where it stands. I had to completely excavate the holes my roses are planted in d/t the awful clay I have here and I added a layer of drainage rock and then were planted in a mixture of compost, peat moss, and very little of the top layer of fertile clay. My mulch is s thought. JG was sprayed with horticultural oil in early spring but nothing since - good question - sorry I forgot to mention this. I don't remember having hot or very cold weather after spraying.

Buford - Sunburn is also a possibility. Maybe with spraying it with horticultural oil it caused this. Only 2 JG and one Claire were affected but it is definitely a thought.

Steve - This spring was awful for spider mites with the hot/dry weather but JG was not one that was affected. Other's sure were.

I hope you get it figured out Dave!

I think the roses are deficient in an element, perhaps. It's not iron, but manganese (maybe). Have you been doing a lot of watering, or has there been lots of rain lately? Diane

I did some checking, and your roses' leaves do have the look of manganese deficiency--yellowing between the green leaf veins, and browning at the leaf edges. Diane

Those look like old leaves. What does the new growth look like?

You may be right on that, Diane.

The new growth looks fine but the old growth not so much - although it appeared when it was new in spring. $20 for a soil test and where all of my rose holes have similar but little different soil composition and some given different supplements I'm not sure if that'd be worth it. I wish there were a reliable home soil test that provided more info than NPK and Ph.

Do you have alkaline soil, Dave? Those with this kind of soil have more trouble with iron and manganese deficiency. Diane