Thankx

The black streaks are probably stem canker of the botrytis type that entered at pruning cuts. I have seen it spread aggressively when a plant is dormant or semi-dormant, and for that reason I avoid unnecessary pruning in fall or winter. Actively growing plants have an immune response that usually prevents the runaway spread of such infections. If you prune out cankers, sterilize the pruners and cut > one inch below the visible infection and just above a leaf or latent bud (former leaf site). But it is probably not good to keep nipping repeatedly during winter, if you have real winter there.

Yellow canes are dying canes. The fungus might have attacked because the canes were already dying for some reason, or it may have caused them to die. Sometimes roses die back for mysterious reason, for example poor conditions during cold storage before you bought it. No telling whether the plant will survive or not.

Other plants are budding and this is the worst looking with very few leaves.