older mugo pine problem
Some of the needles throughout 3 of my mature mugo pines are turning brown and dropping off. The remaining stems have a black charred look, and some have a slight whitish powder at the base of the needles. They are in different areas of the yard and have different sun exposure. They have also gotten the same amount of watering as other shrubs in their areas. What could the problem be and how do I treat it? Thank you for your help.
Sounds like Rhizosphaera Needle cast or Cytospora Canker Disease. Which are both Fungus diseases. I would recommend calling your local Extension Service to obtain more information on options for controlling and prevention.