Dying colorado spruce, both blue & Green.

Asked May 18, 2016, 7:14 AM EDT

30 years ago, we planted over 900 spruce trees in our yard. They now are aging, many have white

sticky on branches. Should that branch that has turned brown & purplish be cut off to avoid spreading

the disease? What can I do when I see the dripping of the white stuff?

Edmunds County South Dakota trees and shrubs

1 Response

Based on the symptoms this appears to be cytospora canker, a common disease of Colorado spruce. It is very common on mature spruce, those more than 25 years old. The only effective treatment to slow the disease is to prune out the dying branches (during dry weather). This will not eliminate the disease but seems to help slow the upward spread.