Your description suggests that your Colorado blue spruce (Picea pungens ‘Glauca’) is suffering from cytospora canker, a disease caused by a fungus that attacks spruces, hemlocks, firs and larches.

Red spruce occupies the Appalachians into upper Northeastern states and provinces. White and blue spruce trees mainly grow throughout most of Canada. Englemann spruce, blue spruce, and Sitka ...