
roseman
Answered on July 19, 2012
It could be a form of canker. Here are a couple articles that may be of help to you. Also be sure no dogs have used the area for a bathroom, as they can kill a rosebush with signs like you mention.
https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-canker-fungus.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/brown-canker-roses.htm
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