Pummelo Tree Branch Dieback: Prune Out Disease, Don’t Just Spray

The Case

A 10‑year‑old pummelo in Hawaii has bark eroding on branches, wood exposed, tips dying. Diazinon failed; Daconil applied recently.

Expert Advice

Symptoms suggest branch canker/dieback fungus. Fungicides don’t penetrate wood. Best practice:

1. Prune out dead/dying branches 6–10″ into healthy wood.
2. Sanitize tools between cuts.
3. Destroy prunings.
4. Maintain vigor with fertilizer and water.

Next Step

Send a photo of the transition zone (healthy to dead) for confirmation.