Blue Spruce, Forestry, Extension

Information on Blue Spruce trees provided by the Forestry Extension at Utah State University

Two trees you should never plant in Illinois - Colorado blue spruce and Callary Pear, Illinois Extension

Spruce needle rust

Canker attacking older Montana blue spruce

Engelmann spruce, tree

What's Wrong with My Blue Spruce Tree? – Maryland Grows

OSU Extension agent offers resources for forestry and ecology, Features

How to Make your Blue Spruce Bluer! - Laidback Gardener