I have over 20 cone shaped/ pyramid shaped conifers ? arborvitae holmstrup or emerald.They are about 6 ft in height and were planted over 6 years ago.In the last few weeks brown patches have appeared at the bottom of the trees and has spread throughout 2/3 of the trees. While on other trees areas at the bottom of the tree have turned black in colour as if they were burnt .Could you please tell me what has caused this and what i can do to treat it . Thanking you.
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