Was your Tropicana a body bag rose?

Usually stressed out roses from body bags have a difficult time establishing themselves. I do not believe that the canker will spread to other roses. Just give it a lot of TLC, and it should turn around and thrive. Give it time.

Moses.

Prune off the dead ends and the rose will look better.

I agree with Sheila. Prune off the cankered canes down to where you see healthy green cane. This is a common effect with any newly planted rose for me, particularly bare root roses (including "body bag" roses from big box stores like Lowe's) or potted roses from various sources. It's usually an indication of canker, which is not easily avoidable, so my best strategy is to be vigilant and prune ahead of the canker. Unpruned it will spread further down the cane, but if you can prune to healthy growth it is usually fine.

With grafted roses (which applies to most roses sold in big box stores) you want to avoid pruning off the graft part or you'll lose the Tropicana rose and leave only the root stock it's grafted on. If you ever see a rose that all of a sudden "turns red" after being pruned down below the graft, that's an indication of a common root stock that has replaced the rose you wanted. In your picture, I think the graft is the knobby bit at the base of the rose in the bottom of the second-to-last picture. You can prune all the way down to that knobby graft, but not below it.

In your case, I'd prune the middle two canes in the first picture. The one with black that's on the left I'd prune down to the place where the healthy growth juts out to the left. However, if the main cane has canker on it that we can't see in this picture below that healthy growth, you'd want to prune below that growth. The rose will recover from the healthy cane. The second of the black canes in the first picture I'd probably prune down to the bottom of the cane that's attached to the graft.

In terms of whether canker spreads, it can spread down the cane of the affected rose, which is why you prune it off. I don't know of any impact of canker on that particular rose affecting nearby roses. Canker can be affected by environmental conditions and can be triggered by common factors that exist in gardens, but those factors would exist regardless of what you do with a particular rose. It's like blackspot - if you live in a place where blackspot is prevalent, it is likely to affect multiple roses because of the conditions, not because one rose infects the other one. Some roses can be resistant to blackspot, but in my experience canker can show up on any rose grafted or own root so I continue to watch for it throughout the growing season and prune below it when it occurs.

Good question and your rose looks healthy. Just prune out the affected bits - that's the bottom line of this long-winded answer.

Cynthia

When a bagged rose lacks enough roots (they typically get massacred to fit the bags) to support top growth, the plant might be forced to abort some of the shoots. That is not unusual. I think you do want to prune the dead part. You can find plenty of info on proper pruning of roses online.

Yeah it came in one of those rectangular plastic black pot/container thing at Lowe's. I'll cut off the middle two canes in the first picture since it's basically yellow/black all the way to the base where it's growing from, and the smaller one in the right middle that's also affected. Thank you all, hopefully it never comes back!

A little update...I thought I got all of it to the base but it looks like the yellow/black discoloration from the canker has made it's way into the bud union area at 2 points. Any chance of saving this rose? Do I cut into the bud union to get it all out. The bud is kinda small and I can't tell how much green is left as a lot of it is just brown wood.

The advice here was correct. You should have pruned the dead stuff shown on the earlier photos, but don't prune below it. Roses have leaf buds we want to prune just above, so as to encourage new growth from the leaf bud. If you prune below the bottom leaf bud on that cane you invite total annihilation of that cane.

On that last series of photos I see at least one leaf bud on the left cane nearly to the bottom on its right side. On the right cane there is a very tiny leaf bud almost at the bottom of the cane. You must let it grow from here. And if it doesn't, replace it next spring.

I am not so sure you had canker. Sometimes things happen.