Some dark red roses will sunburn on the edges. Perhaps the weather suddenly grew hotter and brighter?

Michael - not hotter and brighter. In fact, it has been getting down in the fifties at night. I noticed this is not in just one area of the garden. It is on some of the other dark red roses also. One is Lincoln. Perhaps I should have posted this in another forum. Not too many replies, but I surely do thank you, Michael. It was so noticeable that I felt compelled to try and find out. If I don't hear anything else, I will try to post it on the regular roses forum--but first I have to get out our monthly newsletter. Time is of the essence. Thanks again. - Barb