The holly died from cottony scale (white fuzz on leaf undersides). The black powder on the porch/lattice is sooty mold growing on scale honeydew—not a pathogen waiting for the new plant.
No soil treatment needed. The mold is harmless to new plants. Simply remove visible mold for aesthetics. Inspect new holly regularly for scale on leaf undersides; treat early with horticultural soap or oil if found.
Self‑Fertile Holly No Berries: Weather Stress or Thrips?
Identifying and Managing Powdery Mildew on Holly Bushes
White Cottony Growth on Burning Bush: Woolly Aphids or Powdery Mildew?
Sooty Mold and Scale on Holly: A Two-Step Treatment Plan
Holly Leaf Spot: Fungicide Too Late Now, Plan for Spring
Holly Leaf Miner Control: Systemic Insecticide Timing and Life Cycle
Ligustrum Leaf Issues: Diagnosing Tiny Leaves and Browning in Florida
Holly Cottony Scale: Systemic Insecticide
Jade Plant Losing Leaves: Overwatering, Light Issues, and Recovery
Holly Bush Dying: Scale Insects or Winter Injury
Brown Leaves on Holly: Diagnosing and Treating Winter Injury
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