Serviceberries, Amelanchier, are subject to cedar-apple (or cedar-hawthorn/quince) rust and there must be a host plant (juniper) nearby in order for this disease to recur every year. Unfortunately unless you can locate and remove the host plant, you will be battling this problem continually. Ninebark, Physocarpus, is also a member of the rose family and therefore technically susceptible but I have never seen it referenced specifically with the juniper-based rusts, however all Rosaceae are prone to some sort of rust infections.

There are fungicides registered for control of this problem, however like all fungicides, they will be preventative rather than curative in mode of action - you need to apply them before you see signs of the disease.

Both plants can take hard pruning although I'm not sure now is the ideal time to do so nor will it necessarily fix the problem.

I live in the suburbs with lots of mature trees and well developed yards. If there is an infecting juniper around I wouldn't know. What does the infected junitper look like. I do have a Juniper tree in a pot, been there for years, gets berries, but I never recognized anything that looks like rust or a fungus.

The rust rarely does any serious damage. It mostly impacts the fruit in my experience. Leave it alone. The spores travel a long way -- forget about eliminating the juniper.

Try just knocking the aphids off with a good blast of the hose. Provided you're not using any broad spectrum pesticide, the aphid eaters (like lady bugs) will usually take care of the problem themselves.

The spores travel a long way -- forget about eliminating the juniper.

I second that...I think it can be up to a mile away?
The hawthorns I had where infected and no one in the neighborhood had a cedar.

You will just have to live with the disease unless you have it sprayed at the right time. Even then if you have the right conditions it may not resolve the issue.

My serviceberry was defoliated by September. Didn't really show much fall color at that point.