Orange Tree Bark Peeling with Black Fungus: Drainage Is Key

The Case

A 10‑year‑old orange tree in Israel suddenly shows bark peeling with black fungus underneath. The owner waters 15 min/day via drip; decorative rocks surround the base.

Root Cause

Excess moisture at the trunk. Citrus roots are shallow and need to dry between waterings. Rocks trap moisture, promote fungal growth (likely Phytophthora foot rot), and cause bark to slough.

Corrective Actions

1. Remove all rocks, mulch, and plants from the trunk out to the drip line. Expose bare soil.
2. Adjust irrigation: Water deeply but infrequently—~3.5 in/week in summer, every 2 weeks in winter if no rain.
3. Monitor: Peeling should slow as the trunk dries. If black fungus spreads upward, consult a local agronomist.

Follow‑Up

The owner confirmed no over‑watering; the expert reiterated that rocks prevent drying. Removing them is the primary fix.