Ask-a-Dave's-Gardener: Do my knockout roses have rose rosette?, 2 by GardeningAAB

GardeningAAB wrote:
My knockout roses wee beautiful last year but have struggled this year. They budded in the spring but the buds never fully bloomed. They turned brown and died. A friend told me to try cutting the bushes way back to see if the needed to rejuvenate. When I did that I was able to see the stems much better. After doing a little research I am now worried that they may have rose rosette. What do you think?