Difficult to see the culprit on the image. They could be red aphids. I would remedy the situation by giving the rose and leaves a good spray of water from the hose.

Lynn

Thank you Lynn.. yah it was hard to zoom enough and keep it focused

You can try this solution for spraying, no chemicals need, effective but you need to keep your eyes closely: ginger + garlic + hot chilli, mix with water, grind them in juicer, filter them and spray the liquid. The left over you can poor on the groun to keep other bugs at bay. Rose won't die from this solution, for sure. I did it.