Rose - Overabundant thorns
Rose rosette virus? Several of our roses including a William Baffin rose have more and more thorns over the last couple years. Based on internet searches, I think it might be caused by Rose rosette. If it is, it sounds like we need to dig up and destroy the roses. How do I know if the roses have this virus? What do we do if they do? We still have several rose bushes that look healthy. Any advice on those? Thank you, Debbie Petersen The first Rose is a John Cabot climber, The second picture is a William Baffin.
https://www.provenwinners.com/learn/pest-management/what-rose-rosette-disease Check out the symptoms in the fact sheet. You may have to wait until your roses leaf out and then if you think it has rose rosette virus, report it ( link in fact sheet). Samples can be sent to the plant disease clinic for diagnosis. It is expensive because the testing requires looking at the tissue with an electron microscope. I last heard it is about 45.00 per sample. https://pdc.umn.edu/