Red Chokeberry (Aronia arbutifolia) is a lovely native shrub which has great wildlife value. Like serviceberry, it can be susceptible to rust diseases but perhaps to a lesser extent. There is not a lot of research to tell us otherwise. 
Native plants can often have leaf spot or rust diseases and still fill their niche in the landscape. For instance, I have large Hawthorn trees that get Cedar-Quince or Cedar-Hawthorn rust each year (some years worse than others depending on the weather and disease pressure) and are still able to produce the berries that birds will eat, even if they are unappetizing to us.

Even if you didn't have an Eastern Red Cedar (Juniperus virginiana) in your yard, the disease can carry from up to a couple of miles
away to affect your plants. Treatments are not recommended as
native plants have succeeded for eons in concert with other native flora and fauna and don't need our help to survive, though it does take some readjustment on our end to accept that plants are not going to look perfect. 

If you keep an eye out in late winter, you can see the brown blobs ("cedar apples") on the cedar and pull the ones you can reach off and throw away to reduce how much pathogen is in your yard. 


Christine