A Technical Report from The Bartlett Tree Research Laboratories
The fungus Rhizosphaera kalkhoffii causes premature needle drop on spruce and pines. Colorado Blue spruce is most susceptible, followed by Englemann, white and Norway spruce. Significant levels of defoliation will result in loss of tree vitality and early death.
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- We have several blue spruce trees in our yard and one is dying, dropping green needles, and turning brown. I don't want it to spread to the others. The trees are about 20 to 25 years old and have always been beautiful. If there is a known problem this year, perhaps you could recommend a spray.
- We have three big Blue Spruce trees in our front yard. All of a sudden, the branches have started to turn brown and are very brittle. What is going on?