Additional photo confirms borer damage: sap flow, bark wounds. Same treatment: Merit trunk spray + 10-10-10 fertilization.
Likely Hypoxylon canker; fertilize to support remaining vigor.
Identifying and Managing Slime Flux (Bacterial Wetwood) in Mature Cottonwoods
Redwood Top Dieback: Internal Decay, Monitor for Hazard
Neighbor's Bamboo Threatening View: Running vs. Clumping
Persimmon Seedling Timeline: Fruiting Age and Pollination Biology
Estimating the Age of Large Oak Trees Without Cutting Them
Leyland Cypress Topping: Bad for Trees, Negotiate Removal Instead
Tree Nutrition and Bark Beetle Management in Arizona: Fertilization vs. Injection
Why Wild Persimmon Trees Don't Fruit: Sex Ratio
Trimming and Re-rooting Indoor Yucca (or Dracaena) Trees
Propagating Sycamore: Seeds Work, Cuttings Don't
Why a Bearss Lime Tree Won't Bloom
Pruning a Leggy Rubber Tree (Ficus elastica) for Bushier Growth
Mini Trees for Florida: Conifers, Palms & Flowering Shrubs
Saving Freeze-Damaged Jacaranda Trees in Riverside, CA: When to Prune and When to Call an Arborist
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