Trees, Shrubs and Conifers: Is there any hope for my Viburnum trilobum??, 1 by EarlyMay

EarlyMay wrote:
Hi...just started planting bird-friendly shrubs and trees in my yard last summer--and this is my first discouraging occurrence!
This spring I planted 4 Viburnum trilobum that I mail-ordered from a nursery. I have kept them watered and taken good care of them. They looked good until about the beginning of August and then gradually they have gone downhill with the leaf spots. After a while the leaves with spots curl up on the stem and drop off. I was really looking forward to growing these, but is there any hope for this? I am in Zone 5b at 1800', we get a good amount of rainfall in spring, summer, and fall. The summers are very humid.
A couple of the plants have new growth and the new growth doesn't have spots....but the older growth below does. I guess the new growth will eventually get the spots too?

I read where applying basic copper sulfate as a dust to the foliage will help, but can't find this anywhere. Any advice would be appreciated, as I don't want to rip these out.

I also planted some Viburnum dentatum (Chicago Lustre) and they are doing great! But I wanted to have some variety and the V. trilobum looks good mixed with the V. denatatum.