Question From: Saint Petersburg, Florida, United States
Q: I have a dwarf sand pine that is turning brown fro the inside out. One had already died. This one grew like crazy after it was planted in September of 2015. I have examined the plant and note a white powdery substance (not much of it) on trunk, and a little bit of white (in small pin-head sized areas on parts of the limbs. This one looks like it will die like the first one did--because large sections are completely brown and dead.
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Your fir tree probably has a fungal disease called powdery mildew. This website has a recipe for an environmentally safe spray using bicarbonate of soda. See http://www.growingagreenerworld.com/controlling-or-eliminating-powdery-mildew/ . Be sure to keep your tree well watered. Best And Happy Yardening, Nancy