Q.Rust on Roses
How to treat rust on roses without using fungicide? I don’t want to use chemicals and I am looking for the ‘home grown’ solution.

I fully understand the Home Grown approach. There is a fungicide on the market that truly meets that thought and approach. It is a truly Earth Friendly product called Green Cure. Check it out at this website: http://www.greencure.net . I went to using this product because I did not like all the harsh fungicides on the market. Since finding it I have no more problems with Powdery Mildew, Rust or Black Spot. Apply it per the label for both Cure and Prevention. It meets the Home Grown label well. Here is an article link for you to check out as well on rust: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rust-disease.htm