Daniel Hanna wrote:

In nk.net Me wrote:
Three weeks ago I trimmed all my roses back because of rust, and they
are growing back well.

Even so, that's a bit extreme. Don't trim them. Spray is fine - rust
isn't THAT deadly to roses.

It's not deadly but it is sure unsightly and very hard to control with
organic measures. Cleanup doesn't seem to make much difference. I saw
roses for sale on asphalt completely cloaked in rust. Rust is a curse
of susceptible roses.