juniper trees with lighter green foliage

Southwest, arid, elevation 4500, juniper trees have additional growth spots that are lighter in color and seem to be of a different texture than the 'norm.' What is the cause?
Submitted by BHGPhotoContest

By "additional growth" do you mean that the lighter green spots have a profusion of stems or branches? If so, these could be witches' brooms. Witches' brooms can be caused by fungi, insects or even genetic mutations. Often dwarf plants got their start as a witches' broom.

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