Concolor Mystery

Asked December 5, 2019, 3:48 PM EST

I am responding to a request from John S. who requested photos of affected limbs

Denver County Colorado

1 Response

Cytospora is a fungus which can kill limbs on fir trees. In many cases you can observe cankering on affected limbs; I did not observe any such cankers in your photos, but it may be worth doing a little bit of further investigations.

The following links provide some pictures and more information on this pathogen:

While I don't believe cold injury to be the cause of these dead limbs, I want to provide you with some information on cold injury because it is the season:

Winter Browning:

Winter water can help alleviate drought related problems: