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Arborvitae Sooty Lower Branches: Disease or Shade?

John's 2-year-old emerald green arborvitae (20 plants, soaker hose 6 hrs/week) have sooty grey lower branches turning brittle and falling; some brown higher up.

Possible Causes

Foliar fungal disease—several fungi attack foliage.
Deep shade on lower portions causes thinning.

Next Step

Take affected twigs to local nursery for hands-on diagnosis.

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