Pear Tree Leaf Wilt and Blackening: Overwatering and Fungal Risk

Diagnosing the Problem

A one-year-old pear tree with wilting, blackening leaves despite watering likely suffers from overwatering leading to root rot or fungal infection. Saturated soil deprives roots of oxygen, causing decay and inviting pathogens like Phytophthora or Pythium.

Check Soil Drainage

Push a metal rod 12 inches into the soil near the tree. If it comes up with mucky, wet soil, drainage is poor. Aerate by making several deep holes around the root zone to improve oxygen exchange.

Immediate Actions

• Stop watering until soil is moist but not wet at 6-inch depth.
• Apply 10-10-10 fertilizer lightly (follow label rates) to support recovery—avoid overfertilizing.
• Ensure proper mulching: 2–3 inches, kept away from trunk.

Fungal Management

If root rot is confirmed (mushy, dark roots), a fungicide drench with mefenoxam or phosphorous acid may help, but cultural correction is primary. Improve drainage long-term by amending soil or redirecting irrigation.

Prevention for Young Trees

Water deeply but infrequently—once a week in dry weather, adjusting for rain. Use a soil probe or finger test to check moisture before watering.