Anything I can do to help fatten up a spruce?

[Mycamaro_68]

Norway spruce are very tolerant and will rarely get needlecast. (Unless turf sprinklers hit them multiple times a week they can get it).
Chlorothalonil will work well. 3 applications would work best. You can do one before buds push then one at half elongation and then another 2-3 weeks later.

Thank you!

 

[Nolan]

Needle cast is your problem. You should also ensure enough sunlight and fertilizers.