Solutions
Yates Scale Gun
Spray foliage, stems and trunk as necessary.
Yates Lime Sulfur
Apply as a winter spray, thoroughly wet all parts of the bush.
Rose scale is one of a group of scale insects known as armoured scales. They attack the stems of roses growing in damp, shady places.
White scale coating on older stems.
Is this not the problem that you have? Go back to find the right one...