![](https://csfs.colostate.edu/wp-content/uploads/2016/09/Fall-Needlecast-PonderosaPine300200-2.jpg)
Autumn Yellowing of Conifer Needles a Normal Process
COLORADO – Although thousands of evergreen trees in Colorado are beginning to display dying yellow or brown needles, most are simply going through a natural shedding process – and are not infested by bark beetles or tree disease.