Can you tell me why my rose bush looks like this? I have about 5 stems that are doing this.
Hello again. I sent a copy of your photo to a University Professor friend of mine too. He confirmed that this is classic herbicide damage and he stated specifically Round Up or one that contains the same herbicide ingredient. It is suggested that the canes with the growth be pruned out. Then apply a good organic rose food and water well. There may be more that come forth with this abnormal growth too, prune them out as well.
It looks like your rosebush may have the dreaded Rose Rosette Disease or RRD,some call the disease witches broom. However, if someone has been spraying any herbicides near the roses, the herbicide drift can cause this strange appearance to the foliage as well. Give the article at this link a read on this subject also: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rosette-disease.htm