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Japanese Maple Cracked Bark: Borer or Sunscald?

Two Likely Causes

Borer — spray Merit on affected area.
Sunscald (west side) — wrap trunk Nov–Apr; tree outgrows it.

Action

Spray Merit now (covers both). Monitor. No wound paint.

Trees: Japanese Maple Spring Leaf Damage: Herbicide Injury vs. Winter Kill; Cracked Bark and Lichens on Young Red Maples; Maple Bark Splitting: Normal Aging or Cause for Concern?; Japanese Maple Bark Peeling: Often Normal Exfoliation; Red Maple Bark Decay and Yellow Leaves: Borer Treatment and Fertilization; Red Maple Bark Splitting: Sunscald/Frost Cracks; Japanese Red Maple and Japanese Beetles: Manageable Risk; Minor Leaf Spots on Young Japanese Maple; Diagnosing Leaf Scorch on a Japanese Maple: Watering, Sun, and Hot Tub Chemicals; Caring for a Potted Japanese Maple Indoors: Moisture, Pot Size, and Winter Protection

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