Japanese Maple Coral Bark Branch Dieback: Prune and Monitor

Red coral bark Japanese maple (planted last year, full sun). Upper branches turning dark brown/black, drying. Lower branches healthy, leafing. Heavy rain month.

Two Possibilities

1. Disease organism killing tissue from tips/lateral stubs.
2. Root/soil stress causing tip dieback.

Action

1. Prune discolored branches: cut into healthy wood (back to normal color).
2. Prune dry day, no rain forecast.
3. Disinfect pruners (alcohol) between cuts.
4. Reduce watering (rain sufficient).
5. Watch for new discoloration; prune promptly.

Expert insight provided by Steve.