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The small holes are likely from a night feeding insect. I recommend either spraying the rosebushes with a good insecticide of choice, or giving all of the rosebushes a treatment of Bayer Tree and Shrub granules.

If you haven't read it, this article should help: https://www.gardeningknowhow.com/plant-problems/pests/garden-symphylan-small-white-worm-like-bugs-in-the-soil.htm

Here is a link to an article for you: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rosette-disease.htm

As long as you remove the soils that were in the imediate area where the bush was planted and replace with new amended soils, you should be fine to replant some new rosebushes after 3 to 4 weeks.

I am going to provide you with a couple articles on the subject. One of the articles is on deadheading roses and the other on pruning rosebushes. Please give them a read and feel free to ask more questions as needed. :-)

https://www.gardeningknowhow.com/ornamental/flowers/roses/pruning-roses.htm

https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-deadheading.htm

Here is a link to an article for you on this subject, please give it a read and feel free to ask any further questions you may have. :-)

https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-soil-preparation.htm

This sounds like either a boring insect has bored into the canes, they have sustained some sort of injurty or something has been poured onto the soils that is killing the root system. Neighborhood dogs or coyotes peeing on the rosebushes or around them will cause this as well. This will require some further investigation on your part. Even a late in the evening visit to the garden areas with a flashlight is a good idea. I would prune out the bad and dying parts, then water the rosebushes with some water that has a product called Super Thrive and a good root stimulator mixed into the water. Do this the next 4 to 5 times the roses need watering. It will help with any stresses or shock the roses are going through. You might also water the rosebushes once real heavily first as this will help flush out/dilute any animal urine that could be causing the problems.