Q.rose bush with witches broom
How long after removing a rose bush with witches broom can I replace it with new plant? I would like to replace diseased roses with new plants but unsure how long to wait. Growing season here is long and would like to replace diseased ones as soon as possible. My roses appear to have witches broom virus.

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.