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Lichen on Rose of Sharon: Symptom, Not Cause

Lichen on bark is harmless; dead branches beneath it died from other causes (disease, drought, borers).

Diagnosis

Snap branch tips: dry, brittle = dead.
Prune out all dead wood.
Take sample to county extension for pathogen ID.

Japanese beetles may attack flowers; lichen is just an epiphyte.

Seeding and Propagation: Hypoxylon Canker on Holly Tree: Gas Leak Connection?; Mature Ligustrum Splitting and Declining: Age, Weather, and Rot; Chitalpa (Catalpa) with Bare Upper Branches: Check for Life; Arborvitae Sooty Lower Branches: Disease or Shade?; Lichen on Azaleas: Harmless and Often Misunderstood; Lichen on Roof Shingles: Baking Soda or Copper; Green "Moss" on Japanese Maple Branches: It’s Lichen, Not a Problem; Eucalyptus Respiratory Allergy: Prolonged Exposure Increases Severity; Why Your Dogwood Has Smaller Leaves on Upper Branches; Spiraea: Two Types, Both Easy and Beautiful

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