Dying, Off, Color Pine Needles Normal in Autumn, Colorado State Forest Service

Ponderosa and lodgepole pines and some spruce and fir species Colorado shed older, interior needles as part of an annual growth cycle in September and October.

Blue Spruce dying from bottom on up

Why are my pine trees turning brown? - Christmas Trees

Decision point for the Hunter-Smuggler plan - Aspen Journalism

Colorado State Forest Service says off-color pine needles normal, not disease

Temperature swings damage Colorado ponderosa, spruce trees

My Conifers Are Losing Needles! Should I Be Concerned? - Independent Tree

Pinus resinosa

Help me save my blue spruce - Landscaping

State adopts emergency regulation for removing dead and dying trees – Monterey Herald

Types of Coniferous Trees: Forest Conifers Vs. Deciduous Vs. Evergreen

Pine Tree Care, Tree Health Care

Rocky Mountain Day Hikes - Notes from the Trail Blog

Temperature swings damage Colorado ponderosa, spruce trees