October Glory Maple Canker: Drought Stress, Water, Fertilize, Consult Forester

Water: 1" per week. Pan test: sprinkler until pan has 1".
Fertilize: 10-10-10 at 1 lb/inch trunk diameter. Now + spring.
Consult state forester: Free diagnosis + local pest insights.

Diagnosis

Black, slick, cracked bark on south side after drought = Hypoxylon canker. Stress (drought) allows endemic fungus to invade. No cure.

Southwest bark gets hottest → most drought stress → canker entry point.

Tree may compartmentalize and survive years, or decline. No spray fixes canker. Vigor support is only option.

Photos sent to expert confirmed Hypoxylon. State forester visit highly recommended for valuable landscape tree.

Plant Diseases: Bud Death on October Glory Maple: Cold Snap Damage and Internal Decay Check; Japanese Maple Chemical Injury from House Washing; October Glory Maple Trunk Damage: Borer or Fungus?; October Glory Maple Bark Cracking and Black Sap: Diagnosis and Care; Glory Red Maple Leaf Browning in Florida: Transplant Shock vs. Drought; October Glory Maple Leaf Scorch After Transplant: Stress, Not Disease; Red Maple Limp Leaves: Scale Insects Confirmed; Planting October Glory Maple After Cottonwood Removal; Cracking Bark on Young October Glory Maple: Normal or Problem?; October Glory Maple in 100°F Texas Heat: Survival Guide

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