Drought stressed conifers can experience sudden needle drop. This is a phenomenon where the tree will loose 2 to 4 years worth of unproductive needles in one season. Is it possible your spruce went through a dry period in the past 2 years?
I would like to communicate with you so more, but don't want to go off track on this thread. Could we continue via conversations feature of this site? I have always had interest in BCS machines.
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