Question From: Richland, Oregon, United States
Q: I have a 12 year old douglas fir and the needles are turning Rusty color What may be causing this.
Your tree has a fungal disease. I recommend you have an onsite inspection from a trained tree doctor, a certified arborist. If left untreated, a fungal disease will kill the tree, so don't delay. Best And Happy Yardening, Nancy