White Fir Trees Dying
Concolor fir has been reasonably hardy throughout Michigan and has been touted as a replacement for spruce affected by spruce decline, especially blue spruce, which has been rampant throughout the state. A fungal issue has developed however for concolor firs and you can read more here:
Also, concolor fir can be especially problematic for desiccation from winters drying winds when the trees can't take up water in frozen soils, trees that do not go dormant but still need life giving water and nutrients.
The trees need to be assessed by a professional onsite , namely a Certified Arborist, one who specializes in everything woody. You can find one or more
Certified Arborists in your zip code at www.treesaregood.com Click on the Find an Arborist tab. Arborist evaluations are not expensive but important in determining exactly what is going on in clients trees.